FIELD OF THE INVENTION:
[001] The present invention relates to a system for utilizing drain water by dual storage and its method thereof. More particularly, the present invention relates to a system and method for increasing the water recovery from 20 - 30% to 40 - 100% with minimizing water waste by 1-100%.
BACKGROUND OF THE INVENTION:
[002] Water, being one of the basic necessities of life, is required in every sphere. Since, the water bodies are subjected to various pollutants; they become a source of numerous communicable and fatal diseases. Hence, purification of water is of vital importance. Such purification is performed by water purifiers employing the technique of Reverse Osmosis (RO). Water purifiers remove harmful contaminants from source water and provide pure water that is fit for drinking. The life of the water purifier depends upon various factors including the type of purifier being used such as RO/ UV / GRAVITY etc., quality of the product, quality of input water, regular maintenance, hours and volume of water used, etc.
[003] POU Reverse Osmosis (RO) Water Purifiers have usually water wastage up to 70 -80%) with 20-30%) water recovery and almost same amount (70 -80%>) of water is drained out with hardly 5-10% variations by drain with few variations depends upon input water TDS, environmental conditions and working pressure.
[004] Such a system and method is disclosed in US6524472B2. Said invention relates to monolithically-molded subassemblies are used to retrofit existing reverse osmosis systems into zero waste RO systems. The subassemblies reduce the number of connections necessary such that the retrofitting may be accomplished by unskilled labor. The subassemblies may be integrally packaged together on a backboard and are placed in-line in the inlet to the RO unit and in each of the outlets from the RO unit. For

example, the first subassembly 1 includes an input port for connecting to source of water to be purified, an first portal communicating with a pressure switch, a second portal communicating with a pressure gauge and an output port communicating with the RO unit inlet. Using the subassemblies, the retrofit most typically requires only six connections thereby simplifying system installation, improving system reliability, and extending system longevity.
[005] Such a system and method is disclosed in CN203807258U. Said invention relates to a non-wastewater reverse osmosis water purifier, the inlet valve is connected with the raw water input pipeline, the raw water input pipeline is connected with the booster pump, the booster pump is connected with the first-stage pre-treatment filter, the first-stage pre-treatment filter, the second pre-treatment filter element and the third pre-treatment filter core are cascaded, the third pre-treatment filter element is connected with the inlet of the reverse osmosis membrane element, and the pure water outlet of the reverse osmosis membrane element is connected to the water storage tank through the pure water output pipeline, The reverse osmosis water purifier has an initial water return pipe. One end of the initial water return pipe is connected to the pure water outlet of the reverse osmosis membrane element, and the other end is connected to the inlet of the booster pump. The initial water return pipe is provided with a check valve. And a normally open solenoid valve, a normally closed solenoid valve is provided on the pure water output pipe. The water purifier can recirculate the pure water produced by the reverse osmosis membrane in two minutes, ensuring the quality of the pure water, and adding a pressure regulating circuit, which can adapt to different raw water pressures and ensure the working pressure of the water machine is normal.
[006] Such a system and method is disclosed in US6908546B2. Said invention relates to a process is provided to produce water that will meet the specifications of the United States Pharmacopeia Inc. for Purified Water and Water for Injection, and water for dialysis as circumscribed by the American Association for Advancement of Medical Instrumentation (AAMI). The system has no storage tanks where stagnant water will be

fouled by biofilm colonizing the tank surface. Water is circulated throughout the purification system and drawn as required, on demand. The water is purified and used immediately or recycled and repurified to ensure quality. Sanitation of the purification system, maintaining microbiological purity and cleaning is done by controlling the pH so that it is normally acidic by maintaining a high carbon dioxide concentration in solution, the carbon dioxide being allowed to pass into the permeate from a reverse osmosis membrane assembly used to purify the water.
[007] Such a system and method is disclosed in CN104478039A. Said invention relates to a wastewater-free reverse osmosis purified water machine, wherein five-stage filtration is adopted. According to the wastewater-free reverse osmosis purified water machine, raw water passes through PP cotton, fore-lying active carbon and carbon-rod active carbon or a precise PP cotton filtration core, then enters a resin filtration core, enters a RO membrane through a water inlet electromagnetic valve and a pressurization pump, and is subjected to characteristic dividing through the RO membrane to obtain concentrated water and purified water, a circulation automatic pressure reducing system is additionally arranged on the concentrated water discharge pipe position so as to ensure that the concentrated water and raw water mixture meets the reusing requirement after being uniformly mixed, the circulation system is provided with an electronic component to detect the TDS value of the concentrated water, the combination valve is automatically rinsed so as to achieve purposes of RO membrane service life prolonging and concentrated water emission reducing, and the purified water flows out from the water outlet pipe, flows to rear-laying active carbon through a non-return valve, and is subjected to final filtration through the rear-laying active carbon so as to be drunk by people.
[008] Such a method and system is disclosed in US20090230059A1. Said invention relates to a process for reclamation of waste fluids. A conditioning container is employed for receipt of waste material on a continuous flow for treatment within the container by immersible transducers producing ultrasonic acoustic waves in combination

with a high level of injected ozone. The treated material exhibits superior separation properties for delivery into a centrifuge for enhanced solid waste removal. The invention discloses a cost efficient and environmentally friendly process and apparatus for cleaning and recycling of flowback, or frac water, which has been used to stimulate gas production from shale formations. The apparatus is mobile and containerized and suitable for installation at the well site.
[009] Such a method and system is disclosed in CN105502717A. Said invention relates to a water purifier, relating to a zero-waste discharge RO machine and an intelligent control method thereof, comprising a body, the machine body is provided with a water inlet for connecting the water pipe and a water outlet of the pure water outlet, the water inlet It is connected with the water outlet through the thick water pipe. The body is provided with intelligent flushing water outlet and domestic water outlet. The machine body is equipped with a circulating water circuit for secondary flushing of the RO membrane. The intelligent flushing water outlet and the domestic water outlet are connected with the circulating waterway. The TDS test probe for detecting water quality is provided on the circulating waterway. The control body is also provided on the circulating water path, and the intelligent electromagnetic valve electrically connected to the control panel is also arranged on the circulating waterway. When the TDS test probe detects the water quality exceeds the setting The fixed value, the circulating water circuit starts to flush the RO; when the high pressure switch detects that the water pressure in the pressure tank is lower than the set value, the pure water is started; when the high pressure switch detects that the water pressure in the pressure tank reaches the set value, the water is completed.
[010] Such a method and system is disclosed in US7470366B2. Said invention relates to water purification systems include a reverse osmosis unit, a treatment unit, and an electrode-ionization unit. A reverse osmosis reject stream from the reverse osmosis unit is treated in the treatment unit and provided to concentrating compartments of the electrode-ionization unit.

[Oil] Such a method and system is disclosed in US20120031844A1. Said invention relates to a flow-switch controlled, zero waste reverse osmosis water treatment system having a first conduit for providing a supply of water, a second conduit having an inlet in fluid communication with the first conduit for selectively receiving a flow of water from the first conduit, a reverse osmosis element positioned along the second conduit, the reverse osmosis element separating the flow of water within the second conduit into a purified water stream and a reject water stream, a purified water conduit having an inlet configured to receive the purified water stream and a reject water conduit having an inlet configured to receive the reject water stream and an outlet in fluid communication with the first conduit.
[012] Such a method and system is disclosed in CN106186188A. Said invention relates to a fresh and pure water machine having water saving effect, which is composed of a primary filter core group, a water pump, and an RO membrane group. A pure water backflow pipe is connected to a water inlet pipe after the primary filter core group and before the water pump. Two output lines on a delay power cut control board are respectively connected to the water pump and a water inlet electromagnetic valve. The water inlet pipe after the water inlet electromagnetic valve is connected to a pressure-reduced micro pressure water storage barrel and a concentrated water backflow pipe which is provided with a concentrated water high pressure switch and a four-way valve. An input line of a 24-hour timing control board is connected to a power supply while an outlet line is connected to the water pump. When the fresh and pure water machine is switched on, TDS value of water quality of pure water can reach the standard quickly. The machine is free of waiting for water or has short waiting time, is free of or is less in waste on water, and is effectively prolonged in service life of the RO membrane.
[013] The systems and methods, as described in the prior art, employs a great amount of components for the recovery of waste water thereby increasing the maintenance cost of the water purifiers. Said water purifiers are not able to provide great results in the

amount of water recovered by above stated methods and systems.
OBJECTS OF THE INVENTION:
[014] The objective of the present invention is to design a system and method for minimizing waste water and utilizing drain water in an RO water purifier.
[015] The present invention achieves the objective by designing a system and method that stores waste/drain/reject water in secondary tank and utilize the same by retreating with same or another RO membrane and pump and route.
SUMMARY OF THE INVENTION:
[016] The present invention relates to a system for utilizing drain or unutilized water by dual or multiple storage and its method thereof. More particularly, the present invention relates to a system and method for increasing the water recovery from 20 - 30% to 40 -100% with minimizing water waste by 1-99%.
[017] According to the present invention, the method of re-treatment of waste water comprises the steps of: storing waste/ drain or reject water in a Water Saving Tank (WST) thereby subjecting said water to re-treatment for achieving more water recovery; collecting the waste/ drain or reject water in water saving tank (WST) unless the capacity of said tank is full; re-treating the waste water manually or automatically by the system whereby the main treatment of water may be stopped while the re-treatment process continues or the processes of main treatment of water and re-treatment of waste water may be run simultaneously; treating the waste water by same sediment, carbon or RO membrane performed by different technologies including, but not limited to, sediment; carbon; antiscalant; ultrafiltration; micro-filtration and nano-filtration or combination of said technologies with auto or manual control for the same; controlling the electrical Solenoid Valve (SV) by PCB based circuit for initiating re-treatment.

[018] According to a preferred embodiment of the present invention, two storage water tanks are installed in order to control water wastage, wherein one tank stores the Waste/Drain/Reject water termed as Water Saving Tank (WST) and second tank stores the Purified/RO/Treated/Pure water termed as Treated Water Tank (TT). The sizes of said tanks may vary from 0 to any capacity wherein the number of said tanks installed vary according to the amount of water recovery in said water purifier. The water shall travel with Water Saving Line (WSL) after treatment/ purification to the water saving tank. The raw water enters the water purifier through a 3 way connector wherein said device may or may not be employed for taking water to the unit for treatment/ purification.
[019] According to another preferred embodiment of the present invention, an extra Solenoid valve or mechanical valve or manual valve is installed for the purpose of controlling and initiating the process of re-treatment of waste water. The process of re-treatment of waste water shall start manually or automatically at regular and fixed intervals.
[020] According to yet another preferred embodiment of the present invention, water from Waste/Drain/Reject water tank is subjected for retreatment by same process or a new treatment line. Drain water may or may not have multiple treatment process. Multiple membranes and pumps may be installed for sucking and retreating water from Waste/Drain/Reject water tank. Said concept allows controlling the recovery of water and prevents wastage of excess water.
[021] POU RO Water Purifier means RO followed by Sediment filter, Carbon Filter or some other filters like antiscalant, Pre filter, technologies or purification steps. The water purifiers may be available with or without UV, post carbon, mineral filter, hydrogen and UF in addition. The water purifier consist of a diaphragm booster pump of 50 GPD (Gallon of water produces per day) or 100 GPD or 150 GPD or any capacity. Water purifier may or may not consist of few functional parts like Low Pressure Switch (LPS),

Float Valve (FV), Solenoid Valve (SV), connectors or Vi", 3/8" or PL 6 size, pressure reducing valve (PRV) etc.
[022] According to a preferred embodiment of the present invention, two or more Solenoid valves may be installed in the system to auto control drain or wastage of reject water. Innovation may or may not be controlled by PCB. Auto or manual control can also be controlled by membrane working pressure to control the drain/wastage/reject water. Innovation may control membrane working pressure from 0 - 200 psi by manually or PCB (auto) to achieve desirable results i.e. wastage/recovery/reject.
BRIEF DESCRIPTION OF THE DRAWINGS:
[017] Figure 1 illustrates drain/reject/waste water travel to water saving tank (WST) for storage through water saving line, wherein treated/purify water is stored in treated water tank and challenge/raw/incoming water enters the tank through 3 way connector.
[018] Figure 2 illustrates treatment of water from WST and treated/purify water is stored in treated water tank.
[019] Figure 3 illustrates the storage tanks, one for treated water in treated water tank and another for drain/reject/waste water in water saving tank.
[020] Figure 4 illustrates the treated water tank and water saving tank with other treatment technologies.
[021] Figures 5 and 6 depicts multiple treated water tanks and water saving tanks
[022] List of designations/ reference numbers in figures:
1. 106 - Booster Pump
2. 101 - Water Saving line

3. 103 - Flow restrictor
4. 102 - Treatment purification line
5. 113 - Treated water Tank
6. 114 - Water Saving Tank
7. 105 - Valve electric/manual
8. 104 - Flow restrictor
9. 108 - Sediment filter
10. 109 - Precarbon filter
11. 110 - RO membrane
12. Ill - UV Column
13. 112 - Post carbon filter 14.113 - Tank

15. 115 - Solenoid valve
16. 116 - NRV
17. 107 - Three way connector
18. 117 - Water Saving Tank (Diagram 5)
DETAILED DESCRIPTION OF THE DRAWINGS:
[023] Referring to Figure 1 of the instant invention wherein an exemplary schematic diagram of a RO based potable water system (100) is illustrated. As depicted, the RO based potable water purification system (100) incorporates two water paths, first water path water saving line (WSL) (101) and a second treatment/purification line (TL) (102). Said water saving line (101) and the treatment/ purification line (102) are fixed by a juncture by a suitable pipe or tubing. The drain water from RO unit (100) is fixed by a juncture after FRT (103) for mixing and is flushed out. The treatment/purification line (TL) (102) is incorporated with a solenoid valve, an electromagnetic valve (105) and a juncture before pump (106).
[024] As illustrated in Figure 2 of the present invention, the water saving process, during

the purification process, the raw water enters the RO unit (100) through a 3 way connector (107) and passes through several treatment stages, as depicted from (108) to (112), and stored in treated water tank (113), wherein the drain/reject/waste water is transferred to the water saving tank (114) through water saving line (WSL) (101) and stored therein.
[025] The Figure 3 of the instant invention illustrates a secondary procedure of treatment of water from water saving tank (114) through a valve electrical or manually (105) by treatment/purification line (102), passed through the pump (106) stages, as depicted from (109) to (112) and is stored in treated water tank (TT) (113).
[026] The Figure 4 of the instant invention illustrates two tanks, a primary treated water tank (113) and a secondary water saving tank (114) with all other processes, in said RO unit non return valve (116) may or may not be placed.
[027] Figure 5 illustrates 3 tanks, a primary tank for treated water (113) and two tanks for saving water (114) and (117).
[028] Figure 6 illustrates multiple treated water tank (113) and multiple water saving tank (114)/(117).
DETAILED DESCRIPTION OF THE INVENTION:
[029] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.

[030] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[031] As used in the description herein and throughout the claims that follow, the meaning of "a," "an," and "the" includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. "such as") provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention. Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[032] Aspects of the present disclosure relates to a Reverse Osmosis system (RO) for water filtration. An embodiment of the said disclosure provides a potable or commercial or industrial water system employing the technique of reverse osmosis whereby said system minimizes the wastage of water.
[033] A preferred embodiment of the present invention provides for a RO based water purification or treatment system that may include a feed water inlet means configured to receive feed water, a first set of one or more filters configured in a series to process the

feed water to yield pre-treated feed water, the water then enters the RO unit and further treatment may or may not be performed through post carbon, mineral cartridge, ultraviolet treatment and ultrafiltration treatment or any other technologies may or may not be there for post RO treatment.
[034] The said RO unit, with reject/drain water outlet and with water saving line (WSL), both the piping unit may or may not be configured with a non-return valve, wherein the piping unit may be configured to drain or/and water saving line at the junction point. Furthermore the treatment/purification line (TPL) passes through a dispense valve an electromagnetic valve or solenoid valve, pump, carbon filter for the process of filtration/purification. Treatment/purification line may or may not be configured with non-return valve, whereas, the water path connected with input water line before the pump.
[035] The feed water is treated or purified by the RO unit and the treated water is stored in the treated water tank and the drain or reject or waste water is transferred to the water saving tank through the water saving line and is stored therein.
[036] The solenoid valve ceases the transfer of the drain water into the water saving tank as soon as the said tank is filled to the capacity and the process treatment of drain water is initiated by the RO unit through the treatment/ purification line and continues till the water saving tank gets emptied. A water overflowing detecting device may or may not be installed in all tanks. Concentrate water may be utilized for cooling tower, industrial usage, agricultural, boiler, mopping, washing utensils, flushing in toilets after proper disinfection/treatment/purification.
[037] The water may be treated by multiple treatment/purification process including Sediment filter, Carbon filter, Reverse Osmosis membrane, Ultrafiltration, Micro filtration, Ultraviolet treatment, Post polishing, mineral fortification, Copper, Silver treatment. Said water may be subjected to treatment by same or different RO membrane

as employed for the treatment of raw water. The drain or reject or waste water may or may not be controlled by a controller including, but not limited to, a solenoid valve, an electromagnetic valve, a manual valve, a lead switch, sensors, any another type of valve or manually. The drain water may be treated through one or multiple treatment cycles.
[038] The water purifier system for the re-treatment of waste water comprises of the following components: water purifying means RO followed by sand filter, sediment filter, carbon filter; antiscalant, pre-filter; RO with or without UV, post carbon, mineral filter, hydrogen and UF, MF; a diaphragm booster pump of 50 GPD (Gallon of water produces per day) or 100 GPD or 150 GPD or above to any capacity; a Low Pressure switch (LPS), a Float Valve (FV), a Solenoid Valve (SV), connectors or VA\ 3/8" or PL 6 size, a pressure reducing valve (PRV); a controlling means for the purpose of controlling the process of purification or treatment; junction of purification/ treatment line may vary in the process either after or before sediment filter or before RO filter or at any point or stage before RO membrane or other filters; auto or manual control may control membrane working pressure to control the drain/wastage/reject water from 0 -200 psi by manually or PCB (auto) in order to achieve desirable results i.e. wastage/recovery/rej ect.

We Claim:
1. A reverse osmosis based water purification system, said system comprising of:
i. a feed water inlet means configured to receive feed water;
ii. a first set of one or more filters, configured in a series to partially treat the
feed water; iii. a first set of storage tank to store treated water; iv. an second set of storage tank to save reject/drain/waste water;
v. a water saving line for transferring waste or drain water to water saving
tank;
vi. a series of storage tanks to control recovery of reject/drain/waste water
from the RO unit for maintaining input water loss;
characterized in that said water purification system performs re-treatment of the waste of drain water wherein the wastage of water is minimized to 1-99% and the recovered water ranges from 40-100%).
2. The water purification system as claimed in Claim 1, wherein the treatment or purification line for re-treatment of drain water by said unit may involve a set of purification technique differing from the set performing the purification process on the input water.
3. The water purification system as claimed in Claim 1, wherein the RO membrane is a semi-permeable membrane or a nano-filter membrane.
4. The water purification system as claimed in Claim 1, further comprises of one or multiple pumps configured to supply the partially treated feed water to single or multiple RO or NF membranes at a high pressure side of said unit with required pressure and flow parameters.

5. The water purification system as claimed in Claim 1, wherein first set of one or multiple filters is a combination of anti-sealant, a water softener, a scale inhibitor, means of pre-filtration comprising chemical coagulation, flocculation, clarification, gravity setting, multimedia filtration, activated carbon, sand filter, adsorption media, absorption media, microfiltration and ultra-filtration.
6. The water purification system as claimed in Claim 1, wherein the re-treatment of waste or drain water is initiated manually or automatically at regular and fixed intervals by an electrical solenoid valve.
7. The water purification system as claimed in Claims 1 and 6, wherein the electrical solenoid valve is controlled by a PCB.
8. The water purification system as claimed in Claim 1, wherein said system comprises of a diaphragm booster pump of 50 GPD (Gallon of water produces per day) or 100 GPD or 150 GPD or any capacity.
9. The water purification system as claimed in Claim 1, wherein said purification system incorporates two water paths, a water saving line (101) and a treatment/purification line (102).
10. A method of treatment of waste water by a water purification system, said method comprising the steps of:
i. storing waste/ drain or reject water in a water saving tank thereby
subjecting said water to re-treatment; ii. collecting the waste/ drain or reject water in said water saving tank unless
the capacity of said tank is full; iii. re-treating the waste water manually or automatically by the RO unit; iv. controlling the electrical solenoid valve by PCB based circuit.

11. The method of treatment of waste water as claimed in Claim 10, wherein the main treatment of water may be stopped while the re-treatment process continues or the processes of main treatment of water and re-treatment of waste water may run simultaneously.
12. The method of treatment of waste water as claimed in Claim 10, wherein the waste water is treated by sediment; carbon; antiscalant; ultrafiltration; micro-filtration and nano-filtration or combination of said technologies with auto or manual control for the same.