FIELD OF THE INVENTION:
[0001] The present disclosure relates to water purification system, and more
particularly to a reverse osmosis (RO) based water purification system wherein the user
is allowed to regulate the Total Salt Dissolved (TDS) level of output water using
5 electronic method as per their choice and to suit their taste.
BACKGROUND OF THE INVENTION:
[0002] Water available in community comes from various sources such as borewell, Municipal Corporation, natural water bodies (river, lakes) and tankers, however
10 there is high possibility that the water may contain several contaminations which can be
categorized in chemical (salts, metals etc.), biological (bacteria, virus, protozoa etc.) and
physical (dust, color etc.) impurities. Consumption of such contaminated water may be
hazardous and may even cause cancer like diseases. Water purification is the process of
removing these undesirable chemicals, biological contaminants, suspended solids and
15 gases and similar unwanted particles from water to make water suitable for drinking
purpose. According to Bureau of Indian Standards (IS 10500: 2012), the upper-level
acceptable limit of TDS in drinking water has been set as 500 mg/l. Yet, when the TDS
limit reaches even half of the above-mentioned parameter in water, it is not recognized
as suitable for consumer’s intake due to unusual taste for which it needs to be put through
20 a water purification process for clean & potable water.
[0003] Over the years, several technologies have been developed to improve
water quality by removing undesired contaminations and bring down TDS level to or
below generally acceptable limit. Conventional technologies generally use the process of
25 Reverse Osmosis, popularly known as RO technology to improve water quality by
removing chemical and biological impurities from water and also reducing the TDS level
of water. Whereas, techniques such as Ultra Violet filtration (UV), Ultra-Filtration (UF),
Micro-Filtration (MF) etc. are used to treat water to remove biological contamination.
Over the years, the water purification technology has evolved i.e. new purification
3
systems are now available which could help in manipulating TDS level in water. One
such technology can even change the TDS level of purified water, however it requires a
specialized skills and user may not able to do it on his own. Further, there exist other
technologies which assure to provide an integrated water quality sensor with water
5 purification technology/product identification device for providing from a predetermined
selection of water purifiers based on input water quality. Such technology provides
consumer with option to control TDS level in output water but is prone to provide
inaccurate results after certain period. The integrated water quality sensor detects the
input water quality which may contain high concentration of contamination such as
10 excessive salts, chemical etc. and these contaminations have tendency to
accumulate/deposit on surface of the sensor probe. Upon deposition of salts/chemical on
water quality sensor, the water quality report generated by the system would garner
inaccurate data of TDS based on input water quality, thus, leads to malfunctioning.
15 [0004] Thus, there exist a need for the technology that allow the user to regulate
the TDS level of potable output water as per their preference along with a with high
degree of accuracy.
SUMMARY OF THE INVENTION:
20 [0005] The present disclosure overcomes one or more shortcomings of the prior
art and provides additional advantages discussed throughout the present disclosure.
Additional features and advantages are realized through the techniques of the present
disclosure. Other embodiments and aspects of the disclosure are described in detail herein
and are considered a part of the claimed disclosure.
25
[0006] In one non-limiting embodiment of the present disclosure, the present
application discloses an electronic TDS controller system comprising a reverse osmosis
(RO) unit configured to provide RO purified water by reducing TDS level of input water.
The system further comprises a TDS sensor configured to measure the TDS level of RO
4
purified water and a solenoid valve configured to regulate inflow of minerals, from a
mineral cartridge, into RO purified water. Further, the TDS controller system of the
present application discloses a controller unit operably connected to the TDS sensor and
the solenoid valve, wherein, said controller unit is configured to estimate the TDS level
5 of output water based on the TDS level of the RO purified water and operate the solenoid
valve to regulate the TDS level of the RO purified water to a required level by mixing
pre-treated water passed through the solenoid valve with the RO purified water to provide
potable output water.
10 [0007] In another non-limiting embodiment of the present disclosure, the system
discloses a booster unit configured to receive pre-treated water at input from a water
source and provide two separate streams of high pressure at output. One of the two
streams is sent to the reverse osmosis (RO) unit for RO purification and the other stream
is sent to the solenoid valve through a flow restrictor tube (FRT).
15
[0008] In yet another non-limiting embodiment of the present disclosure, the
controller unit of said system comprises a display unit configured to display the TDS level
of the potable output water, a memory unit configured to store the TDS value of the
potable output water and at least one transceiver configured to communicate with a user
20 device for user selection, to regulate the TDS level of the potable output water.
[0009] In still another non-limiting embodiment of the present disclosure, the
controller unit of said system is further coupled to a potable output water tank and the
booster unit. In particular, the controller unit is configured to sense the level of potable
25 water in the tank and shut the booster unit immediately the tank is full.
[0010] In yet another non-limiting embodiment of the present disclosure, the
controller unit of said system is configured to constantly monitor the TDS value of the
5
RO purified water to regulate the ON/OFF cycle of solenoid valve to maintain desired
TDS level as per the user selection.
[0011] In another non-limiting embodiment of the present disclosure, the present
5 application discloses a method for controlling TDS level of potable output water. The
method comprises the steps of purifying input water to provide RO purified water by
reducing TDS level of the input water and measuring the TDS level of RO purified water.
The method further comprises the steps of estimating TDS level of the input water based
on the TDS level of RO purified water and operating a solenoid valve for regulating the
10 TDS level of the RO purified water to a required level by mixing pre-treated water passed
through the solenoid valve with the RO purified water for providing the potable output
water.
[0012] In yet another non-limiting embodiment of the present disclosure, said
15 method further comprises the steps of splitting pre-treated input water into two separate
streams of high pressure. Whereas, one of the two streams is sent to the reverse osmosis
(RO) unit for RO purification and the other stream is sent to the solenoid valve through a
flow resistor tube (FRT).
20 [0013] In still another non-limiting embodiment of the present disclosure, the
controller unit of said system is configured to perform the steps of displaying the TDS
level of the potable output water, storing the TDS value of the potable output water and
communicating with a user device for user selection, for regulating the TDS level of the
potable output water.
25
[0014] In yet another non-limiting embodiment of the present disclosure, the
controller unit of said system is configured to constantly monitoring the TDS value of the
RO purified water for regulating the ON/OFF cycle of the solenoid valve to maintain
desired TDS level as per the user selection.
6
OBJECTS OF THE INVENTION:
[0015] The main object of the present invention is to provide a water purification
system that allow the user to regulate the TDS level of potable output water using
electronic method as per his choice and taste.
5
[0016] Another main object of the present invention is to provide water
purification system that accurately measure the TDS value of potable output water.
[0017] Yet another object of the present invention is to protect the TDS sensor
10 from direct contact with contaminations present in water such as hardness, scaling,
excessing salts etc. for its prolonged life and consistent water quality results.
[0018] Still another object of the present invention is to continuously monitor the
quality of RO purified water and interrupt the purification process upon sensing water
15 quality reaching beyond permissible TDS level in drinking water based on the output
water quality sensed though TDS sensor.
[0019] Yet another object of the present invention is to provide the water
purification system configured to offer a wide range of water TDS selections based on
20 the water quality sensed by the TDS sensor.
[0019A] The essence of this technology lies in the fact that, it controls the output
TDS by measuring output TDS (not input TDS) and by using a very sophisticated
mathematical calculation and algorithm.
25
BRIEF DESCRIPTION OF DRAWINGS:
[0020] The accompanying drawings, which are incorporated in and constitute a
part of this disclosure, illustrate exemplary embodiments and, together with the
description, serve to explain the disclosed embodiments. In the figures, the left-most
7
digit(s) of a reference number identifies the figure in which the reference number first
appears. The same numbers are used throughout the figures to reference like features and
components. Some embodiments of system and/or methods in accordance with
embodiments of the present subject matter are now described, by way of example only,
5 and with reference to the accompanying figures, in which:
[0021] Fig. 1 illustrates a system for electronically regulating the TDS level of
potable output water, according to various embodiments.
10 [0022] Figure 2 block diagram indicating user selection of TDS level in potable
output water, according to various embodiments.
[0023] Figure 3 discloses a method for controlling TDS value of potable output
water, by way of flowchart, according to various embodiments.
15
[0024] It should be appreciated by those skilled in the art that any block diagrams
herein represent conceptual views of illustrative systems embodying the principles of the
present subject matter. Similarly, it will be appreciated that any flow charts, flow
diagrams, state transition diagrams, pseudo code, and the like represent various processes
20 which may be substantially represented in computer readable medium and executed by a
computer or processor, whether or not such computer or processor is explicitly shown.
DETAILED DESCRIPTION OF DRAWINGS:
[0025] In the present document, the word "exemplary" is used herein to mean
25 "serving as an example, instance, or illustration." Any embodiment or implementation of
the present subject matter described herein as "exemplary" is not necessarily to be
construed as preferred or advantageous over other embodiments.
[0026] While the disclosure is susceptible to various modifications and
8
alternative forms, specific embodiment thereof has been shown by way of example in the
drawings and will be described in detail below. It should be understood, however that it
is not intended to limit the disclosure to the particular forms disclosed, but on the contrary,
the disclosure is to cover all modifications, equivalents, and alternative falling within the
5 scope of the disclosure.
[0027] The terms “comprises”, “comprising”, “include(s)”, or any other
variations thereof, are intended to cover a non-exclusive inclusion, such that a setup,
system or method that comprises a list of components or steps does not include only those
10 components or steps but may include other components or steps not expressly listed or
inherent to such setup or system or method. In other words, one or more elements in a
system or apparatus proceeded by “comprises… a” does not, without more constraints,
preclude the existence of other elements or additional elements in the system or apparatus.
15 [0028] Embodiments of the present disclosure relates to a system and a method
for regulating the TDS level of potable output water using electronic method as per user
preference. Said system discloses a booster unit configured to receive pre-treated water,
from an input water source, as input and provide two streams of high pressure of water
as output. The system further discloses a RO purification unit that is configured to receive
20 water from one of the streams as input and provide RO purified water as output. The
system also discloses having a TDS sensor that is initially configured to measure the TDS
level of RO purified water. Said system further comprises a controller unit that is
configured to estimate the TDS level of input water based on TDS level of RO purified
water and regulate the opening and closing of solenoid valve to mix the pre-treated water
25 passing through the solenoid valve with RO purified water to provide potable output
water of the desired TDS value.
[0029] In the following detailed description of the embodiments of the disclosure,
reference is made to the accompanying drawings that form a part hereof, and in which
9
are shown by way of illustration specific embodiments in which the disclosure may be
practiced. These embodiments are described in sufficient detail to enable those skilled in
the art to practice the disclosure, and it is to be understood that other embodiments may
be utilized and that changes may be made without departing from the scope of the present
5 disclosure. The following description is, therefore, not to be taken in a limiting sense.
[0030] Figure 1 illustrates system 100 for electronically controlling the TDS level
of water as per user selection. The system 100 may comprise an input unit 102 configured
to receive unpurified water from a water source. In an embodiment, the water source may
10 include one of a municipal cooperation water source, tube wells, borings and various like
source that have different concentration of salts dissolved. In particular, the water coming
through various sources may have different concentration of Total Salts Dissolved (TDS)
dissolved. The un-purified water from the input unit 102 is then passed through one or
more pre-filtration units (not shown). In an exemplary embodiment, the one or more pre15 filtration units (not shown) placed at output of the input unit 102 may include any
filtration process other than RO purification. The system 100 further comprises a booster
unit 104 that is configured to receive pre-treated water from the input unit 102. Said
booster unit 104 is configured to split the pre-treated water into two streams of high
pressure. In particular, the booster unit 104 is configured to receive pre-treated water as
20 input and provide two different streams of water, i.e. stream 1 and stream 2, each of high
pressure as output.
[0031] The system 100 disclosed in figure 1, further discusses having a reverse
osmosis (RO) unit 106. In an embodiment the term reverse osmosis unit and RO unit
25 may be used interchangeably. Said RO unit 106 is configured to receive water from one
of the streams coming from the booster unit 104 as input. In an exemplary embodiment,
the RO unit 106 receives stream 2 of water from the booster unit 104 for RO purification
using RO membrane (not shown). It is well known that reverse osmosis is an artificial
process that is created by passing water containing high concentrated salts, minerals and
10
other contaminations through the RO membrane with pressure to reduce the above said
elements from water to a certain limit, usually up to 90%. Further, it is to be noted that
the RO unit 106 is also configured to removes bacteria, virus, protozoa, parasites and
reduces dissolved salts, hardness, pesticides, heavy metals & fluoride etc. from water.
5 The RO system comprises an activated Carbon filter, a particulate Filter and may include
other filters as well. The activated carbon removes chlorine from the water so that the
membrane does not plug with chlorine. The particulate filter is a sediment filter that
removes most of the particulates at the rated pore size. The elaborated description of these
filters is beyond the scope of this full disclosure. The water coming out of the RO
10 membrane is treated water which is used for drinking purpose. Other filters maybe
deployed as per the system design and the raw input water quality which are not explained
here but would be considered as the scope of present invention.
[0032] Further, the system 100 discloses having a flow restrictor tube II (FRT)
15 118 that generates back pressure which helps in eliminating excess salts, minerals and
several other contaminations from pre-treated input water and drains off the rejected
water. It will be appreciated that the Flow Restrictor Tube II (FRT) 118 is an essential
component of all the reverse osmosis process. The FRT II 118 is used in RO systems at
the outlet of reject water to the drain. Flow restrictor blocks the water outflow from the
20 membrane, which causes pressure increase, thereby initiating the process of reverse
osmosis. Also, the flow restrictors create pressure throughout the reverse osmosis
membrane element and maintain a desired ratio of reject flow and permeate flow.
[0033] Said system 100 further discloses having a plurality of mineralizer units
25 108A, 108B. In particular, the system 100 discloses having two mineralizer units, first
mineralizer unit 108A placed at output end of stream 1 and second mineralizer unit 108B
placed at output end of stream 2. The purpose of having mineralizer unit 108A and 108B
is to add additional minerals in the water to enhance the taste and also to regulate TDS
level of the water.
11
[0034] Said system 100 further discloses having a solenoid valve 110 configured
to receive the other stream of pre-treated water from the booster unit 104. Precisely,
solenoid valve 110 is configured to receive water from stream 1 coming from the booster
5 unit 104 via a flow restrictor tube (FRT) (not shown) and passed through the mineralizer
unit 108A. Said Solenoid valve 110 helps in regulating the flow of water that is needed
to achieve the desired results of the present invention. Said solenoid valve 110 is
electronically controlled to switch on and off, which is explained in further detail in below
paragraphs of the present disclosure. Said system 100 also discloses having a TDS sensor
10 112 placed at the output of RO unit 106. In an embodiment of the present disclosure,
single TDS sensor 112 is used at the juncture where both water from solenoid valve 110
(also known as blended water) and RO purified water received as output from RO unit
106 (also known as permeate water) meets, thus the TDS sensor 112 may be configured
to sense the TDS level of output water as well as input water based on estimation. The
15 TDS sensor 112 would work on the estimation method by controlling the TDS level of
the water in two different cases. In the first case, blending line is closed, the RO purified
water (permeate water) coming from RO membrane would have up to 90% less TDS from
input water. Said TDS Sensor 112 attached at the output junction would sense the TDS
level thus estimating the input water quality and intimating the customer. Similarly, when
20 blending line is open, TDS sensor 112 would be able to measure the TDS level of output
water accordingly.
[0035] In order to control/regulate and monitor the TDS level of water in any of
the above discussed scenarios a controller unit 120 is discloses in system 100. Said
25 controller unit 120 is operatively connected to the solenoid valve 110 and TDS sensor
112. In an exemplary embodiment, the dotted lines between the controller unit 120,
solenoid valve 110 and TDS sensor 112 shows the logical connection between the three.
In another exemplary embodiment, the controller unit 120 is configured to initially
measure the TDS level of RO purified water coming from the RO unit 106 when the
12
system is first initialized. Based on measured TDS level the controller unit 120 is
configured to estimate the TDS level of input water, as elaborated in first scenarios
discussed above. The controller unit 120 is further configured to compare the TDS level
of RO purified water with the user selection of TDS value and regulate the ON/OFF duty
5 cycle of the solenoid valve 110 to regulate the mixing of the pre-treated water passed
through the solenoid valve 110 with the RO purified water to provide potable output water
with desired TDS level.
[0036] In order to understand the construction and working of the controller unit 120,
10 reference may be made to Figure 2. In an exemplary embodiment, figure 2 represents an
interaction between the controller unit 120 and a user device 210. Figure 2 discloses the
controller unit 120 having at least one of a display unit 202 to display the TDS level of
the potable output water, a memory unit 208 to store the TDS level of the potable output
water, an anlaysis unit 206 and at least one transceiver 204 configured interact with the
15 user device for user selection, to regulate the TDS level of the potable output water. In
another exemplary embodiment, the transceiver 204 of the controller unit 120 may be
configured to interact with the user device 210 for user selection of TDS in potable output
water, wherein the user device 210 may include at least one of mobile, laptop, PDA and
like electronically controlled user device.
20
[0037] Coming back to figure 1, in an embodiment of the present disclosure, the
percentage of blending may be electronically controlled by using the solenoid valve 110,
whose ON and OFF time is precisely controlled by a programmable controller unit 120
based on input from the user device 210, as shown in figure 2. Thus, the user can select
25 the taste of the output water by changing the on/off duty cycle of solenoid valve 110
through the controller unit 120, either from the attached switch (not shown) in the control
panel of the system 100 or from any other mechanism like mobile phone or remote control
or remotely through the communication device, discussed in above paragraph. Thus, the
system 100 also manages to keep the TDS level of output water around the vicinity of the
13
customer selected value by intelligently varying the on/off cycle of the said solenoid valve
110. If the output TDS value be widely varied from the expected value (either for change
of water quality or for any mechanical failure of the filter stages) and found beyond the
capabilities of the system 100, then the system 100 may stop working and announce the
5 fault condition. Thus, the system 100 is also able to provide the potable water with desired
value of TDS, as per customer’s choice. Further, in order to empower user for setting the
taste of water as per their choice and resolve the issue of varying TDS in input water, the
present disclosure provides user with, but may not necessarily confined to only these
selections in future, three TDS selections.
10
[0038] The controller unit 120 may further remain connected to a water tank 116
and the booster pump 104. The controller unit 120 constantly sense the level of potable
water in the tank 116 and shut the booster unit 104 immediately the tank is full. In this
manner the controller unit 120 stops the wastage of resources by shutting down the
15 booster unit 104 when not required.
[0039] Coming back to figure 2 which discloses an exemplary embodiment for
regulating the TDS level of potable output water. In particular, figure 2 shows an ideal
condition when a user opts for selection X and the present disclosure functions to keep
20 the TDS limit within the ± TDS range or pre-defined TDS threshold (known as upper
permissible and lower permissible limit) for the selection X. For example, let’s consider
that the user through user device 210 selects the TDS level as X wherein this selection
sets up the upper permissible TDS in potable output water, and the lower permissible
TDS in potable output water, therefore offering a X±ΔX permissible TDS range for the
25 functioning. Now as per one case, if a user selects X option in purification system 100
containing present disclosure, it is conveyed to the controller unit 120, wherein controller
unit 120 upon receiving said selection regulates the on/off cycle of the said solenoid valve
110. As a result, pre-treated water from stream 1 will flow through solenoid valve 110
and RO purified water through RO unit 106 will get mixed at a point where TDS sensor
14
112 is placed. TDS sensor 112 will sense the TDS of this mixed water (potable output
water) and based on the instructions from the controller unit 120, purification system 100
will understand the TDS of input water based on the estimation and sends signal to
solenoid valve 110 that would trigger the switching on/off cycle timing. If the TDS of
5 input water is estimated high when user has selected X option, switching on/off cycle of
solenoid valve 110 will be less to ensure less quantity of water from booster pump is
passed though stream 1. This would ensure the upper permissible TDS limit as per user’s
selection is maintained by the present disclosure. If at all this TDS value goes beyond the
upper permissible limit of selection X then the intelligent/efficient purification system
10 100 may shut off the purification system 100 and send alarm to the user.
[0040] In other case, when input water TDS is estimated low after user has
selected X option, the switch on/off cycle of the solenoid valve110 in stream 1 will be
increased. Therefore, solenoid valve 110 will allow more pre-treated water to pass though
15 FRT-I and let it blend with RO purified water to reach to TDS sensor 112. In case the
TDS of this stream of blended water is found lower than the lower permissible TDS limit
of user selection X, even then the intelligent/efficient purification system 100 will trigger
an alert and shut off. Thus, it is specified that each user selection would signal solenoid
valve 110 to function switch on/off cycle within upper and lower permissible TDS limit
20 pre-defined for that user selection and in case TDS sensor 112 senses the TDS of output
water going out of this range, controller unit 120 will shut off the unit to ensure the
legitimacy of the selection.
[0041] Figure 3 discloses a method 300 for regulating the TDS level of potable
25 output water through a solenoid valve 110 being regulated via the controller unit 120, by
way of a flow diagram. The method 300 starts by receiving unpurified water, by input
unit 102, from a water source, at step 302. At step 304, the water in sent to the booster
unit 104, wherein the water reaching the booster unit 104 is pre-treated, through different
purification technologies other the RO purification process. In particular at step 304, the
15
booster unit 104 splits input water into two different streams, with high pressure,. In an
embodiment, the booster unit 104 is configured to convert one stream of pre-treated input
water into two separate streams, i.e. stream 1 and stream 2, of high pressure as output
water, as discussed in detailed disclosure of figure 1. As next step 306, the method
5 discloses sending stream 2 of pre-treated water to the RO unit 106 for purifying pretreated input water to provide RO purified water. Precisely, at step 306, the input water
of stream 2 is purified using RO unit 106. Simultaneously at step 308, the method 300
discloses sending stream 1 of pre-treated input water to FRT1 110 from where it is
received by the solenoid valve 110.
10
[0042] The method 300 further discloses, at step 310 the TDS level of RO purified
water is measured using a TDS sensor 112. Based on this measurement, the controller
116 may then estimate the TDS level of input water at step 312. Finally, at step 314,
based on the above measurement and estimation, the controller 120 starts operating the
15 solenoid valve 110 for regulating the TDS level of the RO purified water to a desired
level by mixing pre-treated water passed through the solenoid valve 110 with the RO
purified water for proving the potable output water of user choice. In an exemplary
embodiment, the controller 120 may be configured to regulate the ON/OFF cycle of the
solenoid valve 110 based on the TDS level of the output water and the desired TDS level.
20
[0043] Although the present invention has been described in considerable detail
with reference to figures and certain preferred embodiments thereof, other versions are
possible. Therefore, the spirit and scope of the present invention should not be limited to
the description of the preferred versions contained herein.
25
[0044] Reference Numerals
Ref. No. Element
102 Input unit
104 Booster pump unit
16
106 RO unit
108A, 108B Mineralizer unit
110 Solenoid valve
112 TDS sensor unit
114 UV/UF filtering unit
116 Storage tank
118 FRT unit
120 Controller unit
202 Display unit
204 Transceiver unit
206 Analysis unit
208 Memory unit
210 User device
302-312 Method steps

We claim:
1. An electronic TDS controller system, the system comprising:
a reverse osmosis (RO) unit configured to provide RO purified water by reducing TDS
level of input water;
5 a TDS sensor configured to measure the TDS level of RO purified water;
a solenoid valve configured to regulate inflow of minerals, from a mineral cartridge, into
RO purified water; and
a controller unit operably connected to the TDS sensor and the solenoid valve, wherein
the controller unit is configured to estimate the TDS level of output water based on the
10 TDS level of the RO purified water and operate the solenoid valve to regulate the TDS
level of the RO purified water to a required level by mixing pre-treated water passed
through the solenoid valve with the RO purified water to provide potable output water.
2. The system as claimed in claim 1, further comprises:
15 a booster unit configured to receive pre-treated water at input from a water source and
provide two separate streams of high pressure at output, wherein one of the two streams
is sent to the reverse osmosis (RO) unit for RO purification and the other stream is sent
to the solenoid valve through a flow resistor tube (FRT).
203. The system as claimed in claim 1, wherein the controller unit comprises:
a display unit to display the TDS level of the potable output water;
a memory unit to store the TDS level of the potable output water; and
at least one transceiver configured communicate with a user device for user selection, to
regulate the TDS level of the potable output water.
25
4. The system as claimed in claim 1, wherein the controller unit is further coupled to a
potable output water tank and the booster unit,
wherein the controller unit is configured to sense the level of potable water in the tank
and shut the booster unit immediately the tank is full.
18
5. The system as claimed in claim 1, wherein the controller unit constantly monitors the
TDS level of the RO purified water to regulate the ON/OFF cycle of the solenoid valve
to maintain desired TDS level as per user selection.
5
6. A method for controlling TDS level of potable output water, the method comprising:
purifying, by a reverse osmosis (RO) unit, input water to provide RO purified water by
reducing TDS level of the input water;
measuring, by a TDS sensor, the TDS level of RO purified water;
10 estimating, by a controller unit, TDS level of the output water based on the TDS level of
RO purified water; and
operating, by the controller unit, a solenoid valve for regulating the TDS level of the RO
purified water to a required level by mixing pre-treated water passed through the solenoid
valve with the RO purified water for providing the potable output water.
15
7. The method as claimed in claim 6, further comprising:
splitting, by a booster unit, pre-treated input water into two separate streams of high
pressure, wherein one of the two streams is sent to the reverse osmosis (RO) unit for RO
purification and the other stream is sent to the solenoid valve through a flow resistor tube
20 (FRT).
8. The method as claimed in claim 6, wherein the controller unit is further configured for:
displaying, by a display unit, the TDS level of the potable output water;
storing, by a memory unit, the TDS level of the potable output water; and
25 communicating, by at least one transceiver, with a user device for user selection, for
regulating the TDS level of the potable output water.
19
9. The method as claimed in claim 6, wherein the controller unit is configured for constantly
monitoring the TDS level of the RO purified water for regulating the ON/OFF cycle of
the solenoid valve to maintain desired TDS level as per the user selection.