FIELD OF INVENTION
[001] This invention relates to a system and a method for water purification  and more particularly but not exclusively to a system and a method for providing pure water having user derived taste opted from possible taste combinations built in a Reverse Osmosis  UV water purifier.

BACKGROUND OF INVENTION
[002] Water pollution has become a major global problem. The water bodies such as rivers  lakes  ground water and so on get contaminated due to the discharge of pollutants from industries and other setups to such water bodies. The water from the water bodies is utilized for irrigation and domestic purposes. However  for drinking purposes  the water has to be purified since the water from the water bodies may be contaminated with physical  chemical and microbiological impurities and may also have a high total dissolved solids (TDS) level.
[003] At present  numerous water filters or purifiers are being used for purifying the water. The water filters or purifiers are designed for specific types of contaminants. Some of the basic water filters or purifiers are distiller  reverse osmosis filter  activated carbon water filter  UV water purifiers and purifiers based on halogen disinfection technologies. Of the available water filters  reverse osmosis filter is capable of providing drinking water with reduced total dissolved solids (TDS) level and hence is most recommended to make the water pure and palatable  where the water tastes brackish or saline and has high levels of hardness and TDS.
[004] Further  reverse osmosis filters or purifiers uses reverse osmosis to purify the water. In reverse osmosis  which is a membrane based filtration method  large molecules and ions in solutions are removed by applying pressure to the solution when the solution is on one side of the membrane. In other words  reverse osmosis is a process of forcing a solvent from a region of high solute concentration through a semi permeable membrane to a region of low solute concentration by applying a pressure in excess of the osmotic pressure.
[005] Reverse osmosis based water filters or purifiers available in the market achieve about 90% reduction in total dissolved solids (TDS) level of input water. Further  the high percentage of reduction of total dissolved solids by reverse osmosis results in substantial removal of minerals such as calcium and magnesium from the input water. However  for drinking purposes  consumption of certain amount of minerals is necessary to maintain good health. Further  it is observed that the pH level of water obtained from the reverse osmosis based water filter is too low  in the order of less than 7pH and hence the taste of the water becomes bitter. Furthermore  various researches reveal that water with a moderate mineral content has a better taste than water with no minerals. To address this problem of water taste some models of domestic Reverse Osmosis water purification units bifurcates the incoming water into two flows. One water line flows through UV path (this path does not have a RO filter) and the other water lines flows through Reverse Osmosis filter. Both these flow lines converge and become one line prior to the storage tank. Consequently  the confluent water falls into the storage tank of the purifier unit. In the process  the unaltered TDS of water flowing through the UV water line manages to add some TDS to the low TDS water flowing through the RO water line. In this method  mixing of Reverse Osmosis purified water with normal UV purified water is achieved manually with the help of a mechanical stop-cock by adjusting the flow rate of water directed through UV treatment line.
[006] Sometimes  the purified water from a reverse osmosis based water filters is fed through a mineral bed to provide the water with a desirable minerals. However  the introduction of mineral bed to the aforementioned process makes usage of the system expensive and further the storage vessel can be a source of bacteria. The addition of desired level of minerals manually by the conventional technique demands the user with necessary skill sets  as in most cases  the common user of the water filters might not be aware of the desired level of minerals and more often will result in inappropriate mixing of minerals with the water having reduced TDS level. Further  in the conventional methods  if the input water quality or TDS changes  the user has to track the TDS of incoming water on regular basis to make manual adjustments.
[007] Further  the water purifiers such as UV water purifier are used to treat water with UV radiations in order to remove virus  bacteria and mold spores from the drinking water. However  the UV water purifiers do not remove the total dissolved solids from the input water. Therefore  usage of UV water purifiers in very high TDS water will result in the output water having brackish/saline taste.
[008] Therefore  there is a need for a system and a method for providing pure water with improved taste which is chosen by the user and to obviate above mentioned drawbacks.

OBJECT OF INVENTION
[009] The principal object of this invention is to provide a system for providing pure water having user derived taste.
[0010] Another object of the invention is to provide user friendly system for providing pure water having user derived taste.
[0011] A further object of the invention is to provide a method for providing an option for the user to select a final TDS/Hardness in the purified water and consequently obtain the desired taste by selecting the taste / TDS options offered by the water purifier.
[0012] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood  however  that the following descriptions  while indicating preferred embodiments and numerous specific details thereof  are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof  and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF FIGURES
[0013] This invention is illustrated in the accompanying drawings  throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings  in which:
[0014] FIG. 1 depicts a water flow in system for providing pure water having user desired taste according to embodiments as disclosed herein;
[0015] FIG. 2 is a flow chart depicting the water flow across the system for providing pure water having improved taste according to an embodiment disclosed herein;
[0016] FIG. 3 is a flow chart depicting the method for controlling the desired taste in the pure water thereby providing pure water having improved taste according to an embodiment disclosed herein; and
[0017] Fig. 4 depicts an alternate water flow in system for providing pure water having user desired taste according to an embodiment of the present invention.

DETAILED DESCRIPTION OF INVENTION
[0018] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly  the examples should not be construed as limiting the scope of the embodiments herein.
[0019] The embodiments herein achieve purification of water and provide better taste to the purified water by using the system 100 as described herein below. Referring now to the drawings  and more particularly to FIGS. 1 through 3  where similar reference characters denote corresponding features consistently throughout the figures  there are shown embodiments.
[0020] FIG. 1 depicts a water flow in system 100 for providing pure water having user desired taste according to embodiments as disclosed herein. The system 100 includes a diverter valve 102 having an inlet 102i  an outlet 102o and an stopcock 102s  a lower pressure switch 104 having an inlet 104i and an outlet 104o  an online Total Dissolved solid (TDS) probe 106 having a TDS sensor 106a  a sediment cartridge 108 having an inlet 108i and an outlet 108o  an activated pre carbon filter 110 having an inlet 110i and an outlet 110o  a plurality of solenoid valves 113  a plurality of three way flow mechanism 112 and 112a  a booster pump 116  a reverse osmosis membrane filter 118 having an inlet 118i and two outlets 118a and 118b  a post carbon filter 120 having an inlet 120i and an outlet 120o  a quartz glass tube 124  a germicidal Ultra violet lamp 126  a storage tank 130 having an inlet 130i  an outlet 130o and a float micro switch 132   a reject flow mechanism 136 having an auto-flesh solenoid valve 113a  a flow regulator 128 and a plurality of non return valves 122. The system 100 further includes an electronic control device (not shown) for regulating the functioning of various electro-mechanical components included in the system 100.
[0021] The inlet 102i of the diverter valve 102 is connected to a water source such as a tap. In one embodiment  the inlet 102i of the diverter valve 102 is connected to a water source by using a stop cock 102s. The diverter valve 102 is in fluid communication with the low pressure switch 104 via inlet 104i thereby facilitating a flow of water from the tap into the low pressure switch 104. The outlet 104o of the low pressure switch 104 is configured to allow passage of water to the sediment cartridge 108 by activating the working of the system if the pressure of water is sufficient. The outlet 104o of the low pressure switch 104 is in fluid communication with the inlet 108i of the sediment cartridge 108 through the online TDS probe 106. The TDS sensor 106a provided in the online TDS probe 106 is configured to sense the TDS content of the water that is passed on to the inlet 108i sediment cartridge 108 from the low pressure switch 104. In one embodiment  the TDS sensor 106a is selected from any of the currently available TDS sensors without other deterring the intended function of the TDS sensor 106a as can be deduced from this description.
[0022] The sediment cartridge 108 is configured to remove suspended particles such as dirt  dust  mud and sand from the water. Further  the sediment cartridge 108 is configured to allow a passage of water via the outlet 108o into the inlet 110i of the pre-carbon filter 110. The pre carbon filter 110 acts as a pre filter to the reverse osmosis membrane filter 118. The pre carbon filter 110 is configured to remove or reduce excess chlorine  odor  color and organic impurities in the water.
[0023] The outlet 110o of the pre carbon filter 110 is provided in fluid communication with the three way flow mechanism 112. The three way flow mechanism 112 is configured to bifurcate the flow of water from the outlet 110o of pre-carbon filter 110  such that the flow of water from the outlet 110o is divided into a first portion and a second portion. Further  the first portion of water is directed into a first channel 112f  and fed into the inlet 118i of reverse osmosis membrane filter 118 via the solenoid valve 113 and the booster pump 116. The booster pump 116 is configured to increase the pressure of the water that flows into inlet 118i of reverse osmosis membrane filter 118 has increased pressure.
[0024] The reverse osmosis membrane filter 118 is configured to remove dissolved solids from the water. The reverse osmosis membrane filter 118 includes a semi-permeable membrane (not shown) having small passages. The small passages in the semi-permeable membrane are configured to allow water to pass through them and prevent the normal dissolved solids. Typically  feed water that is pumped into the inlet 118i of the reverse osmosis membrane filter 118 has increased pressure. The pressure forces the water molecules through passages of the semi permeable membrane and leaves the dissolved solids behind. Thus  there is created a stream of water  called purified water  having relatively low dissolved solids that flows into outlet 118b and a stream of water  called the brine or reject water  having a relatively large quantity of dissolved solids that flows into outlet 118a.
[0025] The post carbon filter 120 is configured to receive the purified water from the outlet 118b of the reverse osmosis filter 118 through the inlet 120i. The post carbon filter 120 is configured to further remove any traces of odor and organic impurities and further is configured to impart freshness to the water. Fresh and purified water from the post carbon filter 120 is allowed to pass through the outlet 120o of the post carbon filter 110 to the quartz glass tube 124 via the three way flow mechanism 112a.
[0026] The reject flow mechanism 136 is configured to receive brine water from the reverse osmosis membrane filter 118 through the outlet 118o. Further  the reject flow control valve 136a and the auto flush solenoid valve 113a provided in the reject flow mechanism 136 is configured to flush the brine solution out of the system 100.
[0027] Further  the second portion of water is directed into a second channel 112s from three way flow mechanism 112  and fed into the quartz glass tube 124 via the three way flow mechanism 112a  flow regulator 128  the solenoid valve 113 and the non return valve 122. The flow regulator 128 is configured to control the flow of water across the second channel 112s that flows into quartz glass tube 124.
[0028] The three way flow mechanism 112a is configured to channelize the stream of purified water and the stream of water from flow regulator 128 into quartz glass tube 124. The stream of water from flow regulator 128 includes unaltered natural minerals as present in incoming tap water. In another embodiment  the three-way flow mechanism 112a is configured such that at any given point of time  it allows only one stream of water into the quartz glass tube 124  i.e. either the stream of purified water from 112f or the stream water from flow regulator 128. Further  the UV housing containing the quartz glass tube 124 also includes an ultra violet lamp 126. The ultra violet lamp 126 is configured to treat water with UV radiations in order to remove microbiological contamination like viruses  bacteria and mold spores from the water. Further  the storage tank 130 and the quartz glass tube 124 are provided in fluid communication which enables the storage tank 130 to receive the drinking water through the inlet 130i. In one embodiment  the float micro-switch 132 provided in the storage tank is configured to determine the level of water in the storage tank 130. Further  a faucet 134 is provided in communication with the outlet 130o of the storage tank. The faucet 134 is configured to supply the water in the storage tank for various purposes.
[0029] Further  the flow regulator 128 is configured to adjust the time duration of water flow. Further  the time duration of water flow which passes from either of the flow path 112f and 112s will be alternate  such that the total volume of water obtained in the storage tank 130 to be made up by addition of two types of water will be for a graduation of 1litre. For example  for a given hypothetical condition first 400 ml will be delivered by the ‘unaltered mineral content’ path (112s) which will be followed by production of 600 ml RO water (112f). Once this cycle is complete  then again 400 ml of unaltered water will be delivered followed by 600 ml RO water. This alternate delivery will continue till the storage tank of unit gets full which will be identified by the micoswitch 132.
[0030] It should be noted that the aforementioned configuration of system 100 is provided for the ease of understanding of the embodiments of the invention. However  certain embodiments may have a different configuration of the components of the system 100 and certain other embodiments may exclude certain components of the system 100. For example  instead of a three way flow mechanism 112a the quartz glass tube may be provided with two separate inlets  such that the inlets may be configured to receive water from the post carbon filter 120 and water from the flow regulator 128 respectively. Further  the quartz glass tube 124 with UV lamp 126 may be replaced with any other disinfectant media or ultra-filter which does not alter the TDS but meets the microbial filtration standards. Further  the locations of solenoid valves 113  total dissolved solids (TDS) level probe 106  booster pump 116 and non-return valve 122 may also be altered. In one embodiment  the booster pump 116 and a high pressure cut off switch 117 may be provided before the three way flow mechanism 112 such that pressure of water that flows across the first channel 112f and the second channel 112s could be varied desirably. Fig. 4 depicts an alternate water flow in system 100 according to an embodiment of the present invention. Therefore  such embodiments and any modification by addition or exclusion of certain components of the system 100 without otherwise deterring the intended function of the system 100 as is apparent from this description and drawings are also within the scope of this invention.
[0031] In one embodiment  the specification of booster pump 116 is 24VDC; 0.55amps with maximum pressure 120psi. Further  the reject flow restrictor mechanism 136 has a flow restrictor having 600 CC capacities. The reverse osmosis membrane filter 118 is 75GPD and an AC-DC adaptor is selected so as to have an input of 140-300V; 50 Hz and an output of 24V with 1.5A. Furthermore  the quartz glass tube 124 is provided with a 4 watt UV lamp 126.
[0032] Further  the electronic control device (not shown) is configured to regulate the functioning of various electro-mechanical components included in the system 100. The electronic control device includes a processor core  a memory and programmable input/output peripherals. However  it is also within the scope of the invention that the electronic control device may include any other hardware device  combination of hardware devices  software devices or combination of hardware or software devices that could achieve one or more process discussed below.
[0033] The input peripheral of the electronic control device is provided in communication with the online TDS probe 106. Further  the input and output peripheral of the electronic control device is provided in communication with a user interface (not shown). The online TDS probe 106 senses the TDS content of the feed water and transfers the information to the processor core. Further  the processor core is configured to receive the information regarding the TDS content of the inlet water and display the allowed taste bands corresponding to the TDS content of the inlet water  in the user interface via the output peripherals. Further  the user interface is configured to facilitate the user to select the taste band of water. Furthermore  the processor core is programmed such that it controls the time duration of water flow through flow regulator 128 to provide water corresponding to the user preferred taste. In one embodiment  the processor core is configured to control the time duration of water passage through the flow regulator 128. In another embodiment  a booster pump is provided to drive water through Membrane Filter followed by post carbon filter 120 to quartz glass tube 124 of UV housing  such that the user preferred taste of the water is achieved by controlling the volume and time duration of water passage of both the stream of water through their respective flow paths i.e. one stream having unaltered natural minerals and the other stream of purified water produced by RO process.
[0034] In one embodiment  the memory of electronic control device is provided with the information regarding the allowed taste bands for the user to make choice and the recommended taste band corresponding to the TDS content of the inlet water. Provided below is a tabular column depicting the allowed taste bands for selection and recommended taste bands corresponding to the TDS content of the inlet water 
Table 1:

[0035] In one embodiment  the natural input TDS level (0-2000 ppm) which can exist and vary depending upon various factors that include but are not limited to place  source  season and so on has been sub-divided into 8 TDS ranges and six taste bands are identified based on the TDS range. Further  for each TDS range a list of allowed taste bands and a recommended taste bands has been identified. For example  for inlet water having TDS content in the range of less than 100ppm  the allowed taste bands is A/B/C/E/E/F and the recommended taste band is A. Similarly  for inlet water having TDS content in the range of 1500ppm to 2000ppm  the allowed taste band is F and the recommended taste band is also F. However  it is also within the scope of the invention that the TDS range could be further subdivided and more spectrum/taste bands can be included.
[0036] In another embodiment  the information regarding time duration and volume of water passage for the stream of water having unaltered natural minerals and the stream of RO purified water corresponding to the taste bands are identified and stored in the memory of electronic control device. Further  the information regarding time duration and volume of water passage for the stream of water having natural minerals and the stream of RO purified water corresponding to the taste band is utilized by the processor core while controlling the flow through flow regulator128. Provided below is a tabular column  depicting recommended taste band corresponding to the TDS content of the inlet water and the time duration and volume of water passage identified for the stream of water having natural minerals and the stream of RO purified water in order to achieve the recommended taste band and to make up a base line aliquot/volume of 1 litre.
Table 2:
Incoming TDS range (in PPM) Recommended Taste band Time duration (in Sec.) of water passage for water having unaltered natural minerals at flow rate of 6.6 ml/sec Time duration (in Sec.) of water passage for RO purified water at flow rate of 3.3 ml/sec Final TDS achieved (in PPM) for a volume of 1000 ml aliquots
=100 A 150 0 Actual as input
101-189 B 75 150 56-99
190-359 C 30 240 53-100
360-509 D 15 273 65-97
510-759 E 7 289 72-108
760-2000 F 0 303 76-200

[0037] It should be noted that the aforementioned configuration of system 100 is provided for the ease of understanding of the embodiments of the invention. However  certain embodiments may have a different flow path and certain other embodiments may have a different configuration of electronic control device without otherwise deterring the intended function of the system 100. For example  instead treating the water having controlled natural minerals in the UV lamp 126  two separate UV lamp could be provided  one for treating water having natural minerals and the other for treating pure water that comes out of post carbon filter 120 after passing through reverse osmosis membrane filter 118. Further  the outlet of both UV lamps could be controlled through an electronic control device to provide water having natural minerals and could be channelized to the storage tank 130. Further  in an embodiment  an electronic flow meters and electronic flow regulators may be added to the system 100 in order to fine tune the flow volume and flow rates. Further  in one embodiment  the electronic control device is a programmable logic controller. However  it is also within the scope of invention that the electronic control device could be any other device without otherwise deterring intended function of the electronic control device as deduced from this description.
[0038] The method for providing pure water having improved taste using system 100 is explained herein below. FIG. 2 is a flow chart depicting the water flow across the system 100 for providing pure water having improved taste according to an embodiment disclosed herein. The method includes providing water to the inlet 102i of the diverter valve 102 (step 202). In one embodiment  the inlet water is a tap water. However  it is also within the scope of invention that the inlet water could be the water from any other source which has to be purified. The water is diverted inside the diverter valve 102 and is passed to the low pressure switch 104. The water is checked for the total dissolved solid (TDS) levels by the total dissolved solid (TDS) sensor provided in the TDS probe 106 and then sent to the sediment cartridge 108 (step 204).
[0039] Suspended particles in the water such as dust  dirt  mud and sand are removed inside the sediment cartridge 108 (step 206). The resultant water is sent from the sediment cartridge 108 to the pre carbon block 110. In the pre carbon block 110  excess chlorine  odor  color and organic impurities in the water is reduced or removed thereby providing water having natural minerals (step 208). Further  the passage of water having natural minerals from the pre carbon block 110 is bifurcated (step 210) such that the first channel 112f is fed in to the reverse osmosis membrane filter 118 via the booster pump 106 and the second channel 112s is fed into the storage tank 130 via the quartz glass tube 124 having UV lamp 126 and flow regulator 128. The booster pump 106 pumps the water that flows across the first channel 112f in to the reverse osmosis membrane filter 118. In the reverse osmosis membrane filter 118  the total dissolved solid contents in the water is removed as a brine or reject water (step 212)  and the purified water is sent to the storage means 130 via quartz glass tube of UV housing 124 having UV lamp 126  the outlet 118b and the post carbon filter 120. In the post carbon filter 120 any trace of odor and organic materials in the water is removed. Further  post carbon filter 120 imparts freshness to water (step 214). Further  the reject water from reverse osmosis membrane filter 118 is sent to the reject flow restrictor mechanism 136 via the outlet 118a. Further  in the quartz glass tube 124 having UV lamp 126  the bacteria  virus and mold spores from the water is removed (step 218)  thereby providing pure reverse osmosis purified water in the storage means 130.
[0040] Further  the flow of water having unaltered natural minerals across the second flow channel 112s is controlled using a flow regulator 128 (step 216) in order to allow the programmed volume of water to fall into the storage means 130 thereby obtaining a desired ratio with the RO purified water in the storage tank. Further  the water having unaltered natural minerals is transferred into the storage means 130 after passing through the quartz glass tube 124 having UV lamp 126. Further  in the quartz glass tube 124 having UV lamp 126  the bacteria  virus and mold spores from the water is removed (step 218)  thereby providing water having unaltered natural minerals in the storage means 130.
[0041] Further  the flow regulator 128 adjusts the time duration of water flow across the second channel 112s. Further  the time duration of water flow which passes from either of the flow path 112f and 112 s will be alternate such that at any given point of time  the flow of water is from only one flow path (step 220). Further  the total volume of water obtained in the storage tank 130 to be made up by addition of two types of water will be for a graduation of 1litre. For example  for a given hypothetical condition first 400 ml will be delivered by the ‘unaltered mineral content’ path (112s) which will be followed by production of 600 ml RO water (112f). Once this cycle is complete  then again 400 ml of unaltered water will be delivered followed by 600 ml RO water. This alternate delivery will continue till the storage tank of unit gets full which will be identified by the micoswitch 132.
[0042] In another embodiment  both the flow of pure water from the reverse osmosis membrane filter 118 and the flow of water having unaltered natural minerals 112f are controlled using plurality of flow regulators 128.. Further  the pure drinking water having desired taste is obtained in the storage means 130 and dispensed using suitable dispensing mechanism (step 222). In an embodiment  the dispensing mechanism is a faucet 134.
[0043] In one embodiment  the flow of water having natural minerals is controlled by the electronic control device (not shown). FIG. 3 is a flow chart depicting the method for controlling the desired taste in the pure water thereby providing pure water having improved taste according to an embodiment disclosed herein. The electronic control device receives information regarding the TDS content of the inlet water from the TDS sensor 106a provided in TDS probe 106 (step 302). Further  based on the determined TDS content of inlet water the electronic control device provides allowed taste bands (step 304) and recommended taste band (step 306) corresponding to the TDS content of inlet water to the user via user interface (not shown). Further  the user of system 100 is allowed to select the preferred taste band provided in the user interface (step 308). In one embodiment  the user is allowed to select the recommended taste band. In another embodiment  the user is allowed to select the taste band from the allowed taste bands provided.
[0044] Further  to provide the information regarding allowed taste band and recommended taste band corresponding to the TDS content of water  the natural input TDS level (0-2000 ppm) which can exist and vary depending upon various factors that include but are not limited to place  source  season and so on is identified and sub-divided into 6 TDS ranges. Further  on the basis of TDS ranges six different types of taste bands have been identified as A  B  C  D  E and F. Further  for each TDS range a list of allowed taste bands and a recommended taste bands is identified. For example  for inlet water having TDS content in the range of less than 100ppm  the allowed taste bands are A or B or C or D or E or F and the recommended taste band is A. Further  for inlet water having TDS content in the range of 101ppm to 189ppm  the allowed taste bands are A or B or C or D or E or F and the recommended taste band is B. Further  for inlet water having TDS content in the range of 190ppm to 359ppm  the allowed taste bands are B or C or D or E or F and the recommended taste band is C. Furthermore  for inlet water having TDS content in the range of 360ppm to 509ppm  the allowed taste bands are B or C or D or E or F and the recommended taste band is D. Further  for inlet water having TDS content in the range of 510ppm to 759ppm  the allowed taste bands are C or D or E or F and the recommended taste band is E. Further  for inlet water having TDS content in the range of 760ppm to 1100ppm  the allowed taste bands are D or E or F and the recommended taste band is F. Further  for inlet water having TDS content in the range of 1100ppm to 1500ppm  the allowed taste bands are E or F and the recommended taste band is F. Similarly  for inlet water having TDS content in the range of 1500ppm to 2000ppm  the allowed taste band is F and the recommended taste band is also F. However  it is also within the scope of the invention that the TDS range could be further subdivided and more spectrum/taste bands can be included.
[0045] Further  the electronic control device receives information regarding selected taste band and controls the flow of water having natural minerals in flow path 112f accordingly to provide the water with selected taste. In an embodiment  both the flow of RO pure water and the flow of water having natural minerals are controlled in order to provide the water with selected taste. The flow of water having natural minerals is controlled by controlling at least one of volume of passage of water having natural minerals and time period of passage of water having natural minerals (step 310). In an embodiment  the volume and time period of passage of water having natural minerals and the volume and time period of passage of pure water corresponding to each taste band is identified and fed into the electronic control device. Further  the electronic control device utilize the information on the volume and time period of passage of water having natural minerals and the volume and time period of passage of RO purified water corresponding to each taste band in order to provide pure water having desired taste (step 312). In one embodiment  when the TDS content in inlet water changes due to at least one of the factors which include but are not limited to place  source  season and so on  the electronic control device identifies the change in TDS content via the TDS sensor 106a and inform the user regarding the change of TDS content. Further  according to the new TDS range the corresponding allowed taste band and recommended taste band is identified and displayed. Further  in an embodiment  the electronic control device requires the user to select a new taste band. In another embodiment  the electronic device is configured such that it changes the volume and time period of passage of at least one of water having natural minerals and pure water automatically to suit the selected taste band.
[0046] It should be noted that the aforementioned steps for performing the method for providing pure water having improved taste are provided for the ease of understanding of the embodiments of the invention. However  various steps provided in the above method may be performed in the order presented  in a different order  or simultaneously. Further  in some embodiments  one or more steps listed in the above method may be omitted. Therefore  such embodiments and any modification that is apparent from this description and drawings are also within the scope of this invention.
[0047] As is evident from the above description  with the system 100 and the method disclosed herein  the objectives as was set forth initially will be achieved.
[0048] Experiments were conducted for water having various total dissolved solids (TDS) level and the results are monitored. For example  for the inlet water having 300ppm TDS content  the TDS of output water is identified for various taste bands. For the inlet water having 300ppm TDS content  the recommended taste band to the user would be ‘C’ and the allowed taste band would be B or C or D or E or F. Further  for the recommended band ‘C’ the TDS of output water is identified as 83ppm. Table 3 provides various values that are monitored in the system  when the user selects the taste band ‘C’.
Table 3:
As per Band ‘C’ Flow path of water having unaltered natural minerals (A) Flow path of RO purified water (B)
TDS of purified water  in ppm 300 30
Flow rate  ml/sec 6.6 3.3
On time  sec 30 240
Vol. produced of pure water 198 792
TDS obtained of pure water 59.4 23.76
Total output TDS per 1000ml of mix of A and B  in ppm 83

[0049] Further  the system 100 provides freedom to the user to select from any of the allowed taste bands. If the user wishes to have water with low level of TDS/Hardness then that is recommended (‘D’ or ‘E’ or ‘F’)  the following would be the output TDS. For the taste band ‘D’ the TDS of output water is identified as 57ppm. Table 4 provides various values that are monitored in the system  when the user selects the taste band ‘D’.
Table 4:
As per Band ‘D’ Flow path of water having unaltered natural minerals (A) Flow path of RO purified water (B)
TDS of purified water  in ppm 300 30
Flow rate  ml/sec 6.6 3.3
On time  sec 16 273
Vol. produced of pure water 99 901
TDS obtained of pure water 30 27
Total output TDS per 1000ml of mix of A and B  in ppm 57

For the taste band ‘E’ the TDS of output water is identified as 42ppm. Table 5 provides various values that are monitored in the system  when the user selects the taste band ‘E’.
Table 5:
As per Band ‘E’ Flow path of water having unaltered natural minerals (A) Flow path of RO purified water (B)
TDS of purified water  in ppm 300 30
Flow rate  ml/sec 6.6 3.3
On time  sec 7 289
Vol. produced of pure water 46 954
TDS obtained of pure water 14 29
Total output TDS per 1000ml of mix of A and B  in ppm 42
For the taste band ‘F’ the TDS of output water is identified as 30ppm. Table 6 provides various values that are monitored in the system  when the user selects the taste band ‘F’.

Table 6:
As per Band ‘F’ Flow path of water having unaltered natural minerals (A) Flow path of RO purified water (B)
TDS of purified water  in ppm 300 30
Flow rate  ml/sec 6.6 3.3
On time  sec 0 303
Vol. produced of pure water 0 1000
TDS obtained of pure water 0 30
Total output TDS per 1000ml of mix of A and B  in ppm 30

Further  If the user wishes to have water with high level of TDS/Hardness then that is recommended (‘B’)  the following would be the output TDS. For the taste band ‘B’ the TDS of output water is identified as 163ppm. Table 7 provides various values that are monitored in the system  when the user selects the taste band ‘B’.
Table 6:
As per Band ‘F’ Flow path of water having unaltered natural minerals (A) Flow path of RO purified water (B)
TDS of purified water  in ppm 300 30
Flow rate  ml/sec 6.6 3.3
On time  sec 75 150
Vol. produced of pure water 495 495
TDS obtained of pure water 149 15
Total output TDS per 1000ml of mix of A and B  in ppm 163

[0050] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can  by applying current knowledge  readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept  and  therefore  such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore  while the embodiments herein have been described in terms of preferred embodiments  those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

CLAIMS
We Claim:
1. A system for providing pure water having user desired taste  said system comprising:
a water inlet configured to provide water with a first total dissolved solids level;
a means for bi furcating the flow of water with said first total dissolved solids level into a first portion and a second portion;
a first flow channel adapted to receive said first portion of water having said first total dissolved solids level;
a reverse osmosis membrane filter provided in the first flow channel having an inlet adapted to receive water with a first total dissolved solids level from said first flow channel and an outlet adapted to allow water having second total dissolved solids level;
a second flow channel adapted to receive said second portion of water having said first total dissolved solids level;
at least one flow regulator provided in the second flow channel and adapted to regulate the flow of said second portion of water with said first total dissolved solids level;
a storage reservoir and
an electronic control device configured to facilitate user of the system to select a desired taste of an output water 
wherein
said second total dissolved solids level is lesser than the first total dissolved solids level; and
said electronic control device is configured to regulate functioning of said flow regulator to provide water with desired taste by enabling controlled dispensing of water having said first total dissolved solids level into the storage reservoir leading to the mixing of water having said second total dissolved solids level and water having said first total dissolved solids level.

2. The system as claimed in claim 1  wherein said system further comprises

a sediment cartridge for removing suspended particles from water having said first total dissolved solids level;
a pre carbon block for removing at least one of chlorine  odor  color and organic impurities from the water received from said sediment cartridge and allowing passage of water into said first flow channel and said second flow channel;
a post carbon block for removing at least one of odor and organic impurities and imparting freshness to the water with second total dissolved solids level received from reverse osmosis membrane filter; and
an ultra violet lamp for removing virus and bacteria from at least one of water having first total dissolved solids level and water having second total dissolved solids level.

3. The system as claimed in claim 1  wherein at least one total dissolved solids probe is provided for determining said first total dissolved solids level of water from water inlet.

4. The system as claimed in claim 1  wherein said electronic control device is configured to provide at least one of recommended taste band and allowed taste band corresponding to said first total dissolved solids level of water in order to facilitate user to select preferred taste of the output water.

5. The system as claimed in claim 1  wherein said system further comprises a pump provided to pressurize the water which flows into at least one of first flow channel and second flow channel.

6. The system as claimed in claim 1  wherein said electronic control device is configured to regulate functioning of said at least one flow regulator to control the time duration of water passage across the flow regulator.

7. The system as claimed in claim 1  wherein said electronic control device is configured to enable passage of water in said first flow channel and said second flow channel such that water flows in one flow channel at a time

8. A method for providing pure water having user preferred taste  said method comprising:
providing water inlet;
measuring a first total dissolved solids level of water inlet;
selecting a preferred taste band corresponding to said first total dissolved solids level of water inlet;
bi furcating a flow of said water inlet having first total dissolved solids into a first portion and a second portion;
passing a first portion of water having first total dissolved solids level into a reverse osmosis membrane filter;
filtering the water with said first total dissolved solids level by reverse osmosis to obtain water having second total dissolved solids level; and
providing water having second total dissolved solids level with said preferred taste band 
wherein
said second total dissolved solids level is lesser than the first total dissolved solids level; and
said pure water with preferred taste band is provided by enabling controlled dispensing of water having said first total dissolved solids level into a storage reservoir leading to the mixing of water having said second total dissolved solids level and water having said first total dissolved solids level.

9. The method as claimed in claim 8  wherein selecting a preferred taste band corresponding to said first total dissolved solids level of water inlet further comprises providing a recommended taste band and an allowed taste band corresponding to said first total dissolved solids level of water.

10. The method as claimed in claim 8  said method further comprising:
removing suspended particles from said water having first total dissolved
solids level;
removing at least one of organic impurities  chlorine  odor and color from said water having first total dissolved solids level;
removing at least one of traces of odor  organic impurities from said pure water and imparting freshness to said water; and
removing at least one of virus and bacteria from at least one of water having first total dissolved solids level and water having second total dissolved solids level.