DESC:FIELD OF INVENTION:
The present invention relates to the field of prevention or removal of bio film formation and flushing of the treatment train in a water purifier. More specifically, the invention provides an efficient system and a method for reducing/preventing the formation of the biofilm in the water purifier. It also helps in flushing all the filters in treatment train which in turn reduces the stagnation time and the microbial division.
BACKGROUND OF THE INVENTION:
The following background discussion includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

The major issue in the domestic water system is the issue with the formation of bio film inside the tank on continuous usage or due to long storage. The sources of microbes are due to the stagnation of water in the post RO filter which may be a source of microbes in the tank.
A biofilm is a layer of microorganisms contained in a matrix (slime layer), which forms on surface/s in contact with water. Biofilm formation on the inner surface of storage vessels have been reported to offer a suitable medium for the growth of microorganisms and consequently to contribute to the deterioration of drinking water quality in homes. Studies have shown high counts of heterotrophic bacteria and faecal coliforms in stored drinking water, which by far has exceeded the limits set for human consumption. Given the right conditions, a small number of microorganisms in water may also provide a seed, which causes multiplication of the microorganism/s in the storage containers.
There is a direct relationship between the degree of bacterial re-growth on the factors like drinking water storage vessels, the storage materials and the quality of the intake water [(such as temperature, turbidity and concentrations of organic nutrient (dissolved organic carbon–DOC)].
Biofilm formation in the storage tank is a common issue in the domestic water filter. Currently there are many technologies to eliminate the same. Few are disclosed in the following prior art documents. However, the technology in the below mentioned document/s is not efficient and suffers with one or the other drawbacks.
US6464868B1 provides a system and method for removing biofilm from, and/or for preventing biofilm from forming on an interior surface of a conduit that receives a supply of water. The system disclosed by the invention has a means for enabling said supply of water to said conduit, means for disabling said supply of water to said conduit, means for passing an ozone-containing gas through said conduit when said supply of water is disabled. To remove the biofilm from water purification system ozone gas is used. However, the system is not efficient and needs additional means for supplying the gas to the storage tank.
CN201420664892 discloses water purification, in particular, to an ozone oxidation reactor and mechanism of bio film removal in drinking water. However, the technology disclosed in CN ‘892 requires an additional ozone oxidation reactor which makes the system expensive.
US9470007B2 provides a filtration process of water from a tank and is based on emitted ultrasonic waves to reduce or prevent bio film formation on walls of the storage tank. The process includes emitting ultrasonic waves in the tank and adding a flocculent agent to the water, which is not an efficient method for removing the biofilm formation on the wall.
To an extent the available method and system for removal of biofilm are not completely effective. The root cause of biofilm formation is mainly due to the water getting stagnated in the post RO filters. The auto flush mechanism in the water purifier flush only till RO filter to avoid the bio fouling on the RO membrane. If the purifier is not used for more than 30 days there may be condition where the user has to change the complete filtration train. Even the manufacturer claims if the water is stagnated for more than 48hours it is advised to drain the tank.
Hence, there is a need of an efficient method and system for preventing or reducing the bio film formation in a water storage tank and particularly a cost effective and efficient method for flushing the post and pre RO filters at predetermined time in order to avoid the stagnation of water in the filters. The Invention in order to solve the problem provides a system and method based on auto flushing/ customised mechanism for avoiding the stagnation of water in the filter and reducing the bio film formation in the storage tank. This can be time based or manual process or through an intelligent process.

OBJECTS OF INVENTION:
Primary object of the present invention is to overcome the limitation of prior art. Another object of the present invention is to provide a method for prevention of bio film in a water purifier system.
Yet another object of the present invention is to provide a method based on auto flushing mechanism to avoid the stagnation of water for longer time in the filter housing or filtration train. The process of flushing also avoids the source of microbes in the filtration train.
Yet another object of the present invention is to provide a cost effective and efficient method for the prevention or formation of biofilm in the storage tank of the water purifier system.
Yet another object of the present invention is to provide a cost effective and efficient method for flushing the post and pre filter at predetermined time in order to avoid the stagnation of water in the filter.

Yet another object of the present invention is to provide an efficient system for the prevention or formation of biofilm in the storage tank of the water purifier system.
Yet another object of the present invention is to provide an efficient system based on auto-flushing mechanism is to avoid the stagnation of water in the filter housing which will lead to the growth of microbes and can the source of microbes in the tank for forming the biofilm.
Yet another object of the present invention is to provide an efficient system by providing safe water upon longer storage.
Yet another object of present invention is to recirculate the water in the storage tank in order to keep then away from biofilm formation.
Yet another system is to provide secondary microbial reduction or disinfection in the tank such as UV or similar technology to reduce the biofilm in the tank in combination with all filter flushing
Yet another object is to provide an intelligent system to initiate the auto flushing of all filter if the purification cycle not happening for specified period which causes the system to activate the flushing of the filters
Yet another object is to provide a system and method for the draining of the storage tank or activating the secondary disinfection process to protect the tank from biofilm formation at specified time interval or by intelligent process.
Yet another object is to provide a manual/ intelligent system and method for the flushing and draining process of pre and post RO filters in a water purification system.
Yet another object is to provide a manual/ intelligent system and method for performing both the flushing and the draining functions simultaneously or independently

SUMMARY OF THE INVENTION:

The present invention provides a water purification system for removing biofilm from, and/or for preventing biofilm from forming on, an interior surface of a plurality of filters, comprising: means for enabling supply of water to a water tank disposed within the system; means for disabling said supply of water to the water tank disposed within the system; and means for automatically flushing plurality of filters upon identification of non-working of a water pump for a specified time, disposed within the system.
The present invention provides a system and method for flushing of all pre and Post RO filters in the water purifier when not in use. In stagnant condition there is change of microbial growth which will lead to form biofilm in the water storage tank, filters, filter media and filter housings. The invention provides system and method for reducing the stagnation of water in the filters and tank. This will reduce the microbial growth in tank and filters. This process can be manual or automated as per the description provided below.

In an aspect of the Invention, there is provided a water purification system preventing the formation of the biofilm in water storage tank, and flushing of the filter comprising RO membrane along with pre and post filters, comprising:
plurality of filtration unit/s positioned pre-Reverse Osmosis membrane and filter units positioned post Reverse Osmosis membrane, configured to receive the feed water, through plurality of inlet solenoid valve connected with a water supply source via atleast a water pump, for the purification/ filtration of the feed water to be stored in a water storage tank;
wherein
said purification system activates auto flushing, through a programmable controller enabled with an electronic timing mechanism working in communication with the pump upon identification of pump not working for the specified time of 24-72 hours, of water through the plurality of pre and post RO filters;
and wherein the water storage tank is drained manually / automatically through draining / or tank equipped with secondary disinfection technology or microbial disinfection technology, upon identification of purification cycle not working for atleast the specified time of 24-72 hours;
and wherein said RO membrane, pre and post RO filter/s is auto-flushed through opening of first solenoid valve (SV1) connecting the plurality of filters with each other, closing of second solenoid valve (SV2) connecting the flow path of the last filter of said filtration unit to the water storage tank, opening of third solenoid valve (SV3) connecting the flow path of the last filter of said filtration unit to the reject water flow path through the opening of fourth solenoid valve (SV4), thus configuring the flow path for the auto-flushing of said membrane/ filters at a pre-determined time.

In another aspect of the Invention, there is provided a method of preventing the formation of the biofilm in water storage tank, RO membrane along with pre and post filters for the flushing of the filter and storage tank of the water purification system as described above, comprising:
activation of auto flushing mode, through a programmable controller enabled with an electronic timing mechanism working in communication with the pump, upon identification of pump not working for the specified time of 24-72 hours, of water through the plurality of pre and post RO filters;
and wherein the water storage tank is decontaminated drained manually / automatically through draining / recirculation of water or through a equipping the tank with secondary disinfectant technology or microbial disinfection technology dosaging system, upon identification of purification cycle not working for atleast the specified time of 24-72 hours;
and wherein said RO membrane, pre and post RO filter/s is auto-flushed through opening of first solenoid valve (SV1) connecting the plurality of filters with each other, closing of second solenoid valve (SV2) connecting the flow path of the last filter of said filtration unit to the water storage tank, opening of third solenoid valve (SV3) connecting the flow path of the last filter of said filtration unit to the reject water flow path through the opening of fourth solenoid valve (SV4), thus configuring the flow path for the auto-flushing of said membrane/ filters at a pre-determined time.

DETAILED DESCRIPTION OF DRAWING:

To further clarify advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings in which:
Figure 1: illustrates one of the mode on which the present system works, according to an embodiment of the Invention. It illustrates the steps activated under automatic flushing if the pump does not run for 24-72hrs
Figure 2: illustrates holiday mode on which the present system works, according to an embodiment of the Invention. It shows manual flushing mode
Figure 3: illustrates manual activation of the holiday mode on which the present system works, according to an embodiment of the Invention.
Figure 4: illustrates an overview of the water purification system provided by the present invention

Detailed description of the Invention:
For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.

It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof. Throughout the patent specification, a convention employed is that in the appended drawings, like numerals denote like components.

The present invention relates to a system and method of reducing the biofilm formation in the water storage tank when water is stagnated and flushing of filter train at predetermined timing in order to reduce or eliminate the growth of biofilm forming organism in the filters. Stagnation of water leads to microbial growth which in turn leads to biofilm formation. The source of microbes in the tank is from the water stagnated in the filter, mainly carbon filter. The present invention provides a system and method based on auto flushing mechanism for the filter of treatment train on stipulated timing which in turn reduces the microbial entry into the water storage tank.

The water purification system (also called “unit” hereinafter) works in a manner that the inlet water enters the water purifier, which passes through plurality of filters. The tank gets filled and water gets stored in the tank. The unit will restart only if the pump starts again. The filter will have dead volume of water which will get stagnated when pump is not working. Stored water will pave a way for microbial division. When the pump restarts pumping, the water which is microbial contaminated enters the tank. This will divide more and lead to biofilm formation. The system and method provided by the present invention flushes the water in the filters and it will manually or automatically drain water in the tank. If the pump is not working for specified time, the water purification unit will enter the flush mode. During flush mode, the purification cycle gets stopped and only the flushing will happen. All the filters in the system will get flushed at a specific time interval until the flushing mode stops, through the inventive method and system as described below.

In an embodiment, the invention provides a cost effective and efficient method for flushing the post and pre filter at predetermined time in order to avoid the stagnation of water in the filter. The draining or recirculating of water in tank may help in avoiding the biofilm formation in the tank when stored for more than specified time.

In an aspect of the invention, there is provided a system for bio film removal in a water storage tank. Tank can be provided with disinfection technology such as UV LED, UV Lamp or any other anti microbial technologies which can reduce the microbial contamination. The draining of the tank can also be done for biofilm control. The draining can be manual or automatic.
In an embodiment, the system comprises means for operation of an auto-flush mode and a biofilm prevention mode.
In an embodiment, the Invention provides a method of operation of the water purification system as claimed in claim 1, comprising; enabling the means for supply of water to a water tank disposed within the system; disabling the means for supply of water to the water tank disposed within the system; and means for automatically flushing plurality of filters upon identification of non-working of a water pump for a predetermined time, disposed within the system; activating the automatic means for flushing plurality of filters upon identification of non-working of a water pump for a predetermined time, disposed within the system, followed by stopping a purification cycle of the system for specified time; the automatic process can actuate the flushing procedure also the draining of storage tank. The storage tank can also be provided with a disinfection process such as UV lamp, UV LED or similar technology.

In an embodiment, the present invention can be used in the no storage water purifier where in only flushing of the filters will happen automatically or manually to avoid the stagnation of water in the filters. This can be used in any purification technology such as UV /UF RO/ or any other purification technology to avoid the HPC in the filters.

In an embodiment, the system comprises following components:
a) atleast a means for automatically flushing plurality of filtering means on non working of water pump. In an embodiment, an auto flush mode is activated upon identification of pump not working for a first predetermined duration e.g. 24- 72 hours. The auto flush mode stops the purification cycle of the purifier and performs auto flushing of the filter train till last treatment for specified time.
b) atleast a means for automatically draining or recirculation of the storage tank upon identification of purification cycle not working for atleast a second predetermined duration Or user activation of the storage tank drain cycle. In an embodiment, the second predetermined duration comprises 24- 72 hours.

In an embodiment, the system performs following actions if pump does not run for atleast a first predetermined duration like 24 to 72 hours (Illustrated in Figure 1):
a) activation of flush mode till the last filter in the filtration train
b) purification cycle is stopped
c) Activation of auto-flush mode till last treatment train filters for specified time.

Figure 2 illustrates Manual flushing mode, which has following steps:
a) User presses the manual flush button which stops the purification cycle
b) activation of flush mode which causes Tank to get drained automatically/ manually. The tank is provided with microbial disinfection technology
c) Flushing will happen till last treatment train (every 2- 24hrs)
Figure 3 illustrates regular flushing of the filter, wherein every specified hour the flushing of all the filters will happen every 2-24hrs. However, this will happen only if the pump is not working for 2-5hrs.

Figure 4 illustrates an overview of the system. It shows that the activation of the flush mode (automatic or manually) causes opening of SV1, closing of SV2, opening of SV3 and SV4.While, purification mode causes opening of SV1, opening of SV2, opening of SV3 and closing of SV4.

In an embodiment, the flushing mode can be activated manually. The purification cycle will get stopped and only the flushing of the filter will happen till the flush mode is stopped manually. The tank also can be drained automatically or manually to avoid the formation of biofilm on prolonged storage.
In an embodiment, the filtering means comprises carbon filter, RO filter or other filter means used in the conventional water filter.
In an embodiment, the system performs flushing operation every 2-5 hours in case where pump does not run for atleast 24-72 hours.
In an embodiment, the holiday mode wherein the auto flushing mode is activated in case a user goes on vacation and the water purifier is not used which causes stagnation of water and generation of microbes in the water storage tank.
In an embodiment, flushing of filtering means comprises flushing of all filter/s of treatment train on stipulated timing which in turn reduces the microbial entry into the tank.

In an embodiment, the water purification system preventing the formation of the biofilm in water storage tank, and flushing of the filter comprising RO membrane along with pre and post filters, comprising:

plurality of filtration unit/s positioned pre-Reverse Osmosis membrane and filter units positioned post Reverse Osmosis membrane, configured to receive the feed water, through plurality of inlet solenoid valve connected with a water supply source via atleast a water pump, for the purification/ filtration of the feed water to be stored in a water storage tank;
wherein
said purification system activates auto flushing, through a programmable controller enabled with an electronic timing mechanism working in communication with the pump upon identification of pump not working for the specified time of 24-72 hours, of water through the plurality of pre and post RO filters;
and wherein the water storage tank is drained manually / automatically through draining / or tank equipped with secondary disinfection technology or microbial disinfection technology, upon identification of purification cycle not working for atleast the specified time of 24-72hours;
and wherein said RO membrane, pre and post RO filter/s is auto-flushed through opening of first solenoid valve (SV1) connecting the plurality of filters with each other, closing of second solenoid valve (SV2) connecting the flow path of the last filter of said filtration unit to the water storage tank, opening of third solenoid valve (SV3) connecting the flow path of the last filter of said filtration unit to the reject water flow path through the opening of fourth solenoid valve (SV4), thus configuring the flow path for the auto-flushing of said membrane/ filters at a pre-determined time.

In an embodiment, the activation of auto-flush mode stops the purification cycle of the system and performs auto flushing of the plurality of filters for specified time from 10 sec to 5 minutes.

In an embodiment, the RO membrane, pre and post RO filter/s performs purification through opening of first solenoid valve (SV1), opening of second solenoid valve (SV2) and third (SV3), closing of fourth solenoid valve (SV4), thus configuring flow path for the purification of said membrane/ filters at a pre-determined time.

In an embodiment, the system comprises atleast a solenoid valve at the inlet of each filter where each filter is in communication with each other, controllable by the programmable controller.

In an embodiment, the water storage tank comprises disinfectant means comprising UV lamp, UV LED or any other microbial disinfection technology to prevent any microbial division in the tank growth of the dead water in the water tank.

In an embodiment, the filtration unit/s is selected from a group comprising of sediment filter, pre-carbon filter, scale control media, reverse osmosis membrane, nano filtration membrane, mineralizer/alkalizer, post carbon UV system, post carbon ultra filtration membrane, charged membrane or combinations thereof.

In an embodiment, the regular flushing of said filter membrane and RO membrane happens every 2-5hr when the pump is not working to avoid the stagnation of the water in filters and the membrane.

In an embodiment, the present invention provides a manually activated means configured for draining the water tank followed by stopping a purification cycle and initiating flushing for predetermined period. In this embodiment, flushing mode can be activated if the purifier is not used for longer time. In this case the purification cycle will stop and only the flushing cycle will happen until the flushing mode is stopped manually. The water in the tank can be drained manually or it can be protected by the disinfection method such as UV / UV LED or similar anti microbial technologies.

In another aspect of the present invention, there is provided a method of operation of the system as described above. The method prevents the formation of the biofilm in the water storage tank of the water purifier.
In an embodiment, the method of operation comprises inter-functioning of at least two modes provided by the system which is auto-flush mode and biofilm reduction mode.
In an embodiment, the method comprises following steps:
a) activation of the auto-flush mode through auto-flush means in case water pump does not work for atleast a first predetermined duration. The activation of the auto-flush mode stops the purification cycle of the purifier followed by auto flushing till last treatment by train filter for specified time;
b) Automated draining of the storage tank of the purifier in case purification cycle does not operate for atleast a second predetermined duration or manually activated mode

In an embodiment, the method of preventing the formation of the biofilm in water storage tank, RO membrane along with pre and post filters for the flushing of the filter and storage tank of the water purification system as described above, comprises following steps:
activation of auto flushing mode, through a programmable controller enabled with an electronic timing mechanism working in communication with the pump, upon identification of pump not working for the specified time of 24-72 hours, of water through the plurality of pre and post RO filters;
and wherein the water storage tank is decontaminated drained manually / automatically through draining / recirculation of water or through a equipping the tank with secondary disinfectant technology or microbial disinfection technology dosaging system, upon identification of purification cycle not working for atleast the specified time of 24-72 hours;
and wherein said RO membrane, pre and post RO filter/s is auto-flushed through opening of first solenoid valve (SV1) connecting the plurality of filters with each other, closing of second solenoid valve (SV2) connecting the flow path of the last filter of said filtration unit to the water storage tank, opening of third solenoid valve (SV3) connecting the flow path of the last filter of said filtration unit to the reject water flow path through the opening of fourth solenoid valve (SV4), thus configuring the flow path for the auto-flushing of said membrane/ filters at a pre-determined time.

In an embodiment, RO membrane, pre and post RO filter/s is purified through opening of first solenoid valve (SV1), opening of second solenoid valve (SV2) and third (SV3), closing of fourth solenoid valve (SV4), thus configuring flow path for the purification of said membrane/ filters at a pre-determined time.

In an embodiment, the regular flushing of said filter membrane and RO membrane happens every 2-5hr when the pump is not working to avoid the stagnation of the water in filters and the membrane.

In an exemplary embodiment, referring to the figure 1 shows the method step for auto flushing of filters by the system where in the first step shows non working of water pump of the water purifier for 24-72 hours which causes activation of a flush mode shown in second step by the system which stops the purification cycle. This also causes the water storage tank to get drained automatically. In another embodiment, upon the activation of the auto flushing mode, the tank can be disinfected with microbial disinfection technology. The flushing continues till last treatment train ( every 2- 24hr).
Figure 2 illustrates Manual flushing mode, which has following steps:
a) User presses the manual flush button which stops the purification cycle
b) activation of flush mode which causes Tank to get drained automatically/ manually. The tank is provided with microbial disinfection technology
c) Flushing will happen till last treatment train (every 2- 24hrs)
Figure 3 illustrates regular flushing of the filter, wherein every specified hour the flushing of all the filters will happen every 2-24hrs. However, this will happen only if the pump is not working for 2-5hrs.

Advantages of the Invention:

HPC poses major issue in the storage water. The current invention focuses on the flushing of the filter at the different interval and protecting the tank water by draining or by putting any secondary disinfection method. The Invention provides following advantageous features:

• The invention focuses on the flushing of all the filters at specified time interval to avoid the stagnation of water.
• The invention prevents secondary contamination of the tank or storage water
• The invention performs flushing of all filters in the treatment train
• The invention provides a method and system that drains the water manually or by automatic method, where in the pure water production will be stopped only flushing will happen until actuated
• The tank water is protected by using any of the secondary microbial reduction technology such as UV/UV LED etc.
• The full process can be automated by actuating the flushing if the unit is not running for specified time

The Invention is further described with the help of non-limiting examples:

Example 1:
The experiment was performed to test the efficacy of the system. The test and the control unit was run for 4000L capacity. The test unit still give the HPC less than 500cfu/min (WHO standard)
Stagnation Time Test Data Control Data

TNTC- Too numerous to count
,CLAIMS:We Claim:

1. A water purification system preventing the formation of the biofilm in water storage tank, and flushing of the filter comprising RO membrane along with pre and post filters, comprising:

plurality of filtration unit/s positioned pre-Reverse Osmosis membrane and filter units positioned post Reverse Osmosis membrane, configured to receive the feed water, through plurality of inlet solenoid valve connected with a water supply source via atleast a water pump, for the purification/ filtration of the feed water to be stored in a water storage tank;
wherein
said purification system activates auto flushing, through a programmable controller enabled with an electronic timing mechanism working in communication with the pump upon identification of pump not working for the specified time of 24-72 hours, of water through the plurality of pre and post RO filters;
and wherein the water storage tank is drained manually / automatically through draining / or tank equipped with secondary disinfection technology or microbial disinfection technology, upon identification of purification cycle not working for atleast the specified time of 24-72hours;
and wherein said RO membrane, pre and post RO filter/s is auto-flushed through opening of first solenoid valve (SV1) connecting the plurality of filters with each other, closing of second solenoid valve (SV2) connecting the flow path of the last filter of said filtration unit to the water storage tank, opening of third solenoid valve (SV3) connecting the flow path of the last filter of said filtration unit to the reject water flow path through the opening of fourth solenoid valve (SV4), thus configuring the flow path for the auto-flushing of said membrane/ filters at a pre-determined time.

2. The system as claimed in claim 1, wherein the activation of auto-flush mode stops the purification cycle of the system and performs auto flushing of the plurality of filters for specified time from 10 sec to 5 minutes.

3. The system as claimed in claim 1, wherein RO membrane, pre and post RO filter/s performs purification through opening of first solenoid valve (SV1), opening of second solenoid valve (SV2) and third (SV3), closing of fourth solenoid valve (SV4), thus configuring flow path for the purification of said membrane/ filters at a pre-determined time.

4. The system as claimed in claim 1, wherein the system comprises
atleast a solenoid valve at the inlet of each filter where each filter is in communication with each other, controllable by the programmable controller.

5. The system as claimed in claim 1, wherein the water storage tank comprises disinfectant means comprising UV lamp, UV LED or any other microbial disinfection technology to prevent any microbial division in the tank growth of the dead water in the water tank.

6. The system as claimed in claim 1, wherein said filtration unit/s is selected from a group comprising of sediment filter, pre-carbon filter, scale control media, reverse osmosis membrane, nano filtration membrane, mineralizer/alkalizer, post carbon UV system, post carbon ultra filtration membrane, charged membrane or combinations thereof.

7. The system as claimed in claim 1, wherein regular flushing of said filter membrane and RO membrane happens every 2-5hr when the pump is not working to avoid the stagnation of the water in filters and the membrane.

8. A method of preventing the formation of the biofilm in water storage tank, RO membrane along with pre and post filters for the flushing of the filter and storage tank of the water purification system as claimed in claim 1, comprising:
activation of auto flushing mode, through a programmable controller enabled with an electronic timing mechanism working in communication with the pump, upon identification of pump not working for the specified time of 24-72 hours, of water through the plurality of pre and post RO filters;
and wherein the water storage tank is decontaminated drained manually / automatically through draining / recirculation of water or through a equipping the tank with secondary disinfectant technology or microbial disinfection technology dosaging system, upon identification of purification cycle not working for atleast the specified time of 24-72 hours;
and wherein said RO membrane, pre and post RO filter/s is auto-flushed through opening of first solenoid valve (SV1) connecting the plurality of filters with each other, closing of second solenoid valve (SV2) connecting the flow path of the last filter of said filtration unit to the water storage tank, opening of third solenoid valve (SV3) connecting the flow path of the last filter of said filtration unit to the reject water flow path through the opening of fourth solenoid valve (SV4), thus configuring the flow path for the auto-flushing of said membrane/ filters at a pre-determined time.

9. The method as claimed in claim 8, wherein RO membrane, pre and post RO filter/s is purified through opening of first solenoid valve (SV1), opening of second solenoid valve (SV2) and third (SV3), closing of fourth solenoid valve (SV4), thus configuring flow path for the purification of said membrane/ filters at a pre-determined time.
10. The method as claimed in claim 8, wherein regular flushing of said filter membrane and RO membrane happens every 2-5hr when the pump is not working to avoid the stagnation of the water in filters and the membrane.