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 manually using mechanical method as per their choice and to suit their taste.
BACKGROUND OF THE INVENTION:
[0002] Water available in society comes from various sources such as bore-well,
Municipal Corporation, natural water bodies (river, lakes) and tankers, however 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 gases and similar unwanted particles from water so as 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/1. Thus, when 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 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 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 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 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 excessive salts, chemical etc. and these contaminations have tendency to accumulate/deposit on surface of the 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.
[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:
[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.
[0006] In one non-limiting embodiment of the present disclosure, the present application
discloses a mechanical 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 purified water when the system is initialized, and a controller unit operably connected to the TDS sensor. Said controller unit is configured to estimate the TDS level of the input water based on the TDS level of the RO purified water. The system additionally comprises a TDS controller comprising a rotatable mechanical knob, the mechanical knob is manually rotated to regulate the TDS level of the RO purified water to a desired level within a permissible limit defined in the controller unit by blending a pre-treated water passed through the TDS controller with the RO purified water to provide potable output water.

[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 TDS controller through a flow resistor tube (FRT).
[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 a communication unit configured to transmit the estimated TDS level of the input water to a server. In an alternate embodiment, the controller unit further configured to: compare the estimated TDS level of the input water to the permissible TDS value defined in the controller unit; and shut off the system when the TDS level of the input water reaches above the permissible TDS value.
[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 water in the tank and shut the booster unit immediately the tank is full.
[0010] In another non-limiting embodiment of the present disclosure, the mechanical
knob is rotatable manually to its various positions to regulate the TDS level of output water within variable desired band levels.
[0011] In another non-limiting embodiment of the present disclosure, a method for
controlling TDS level of potable output water is disclosed. The method comprises the steps of purifying input water to provide RO purified water by reducing TDS level of the input water, measuring the TDS level of RO purified water, when the method is initialized. The method comprises the steps of estimating TDS level of the input water based on the TDS level of RO purified water, determining whether the measured TDS level of the dispensed water from the RO unit is within a desired range set by a user; upon determining that the TDS level of the dispensed water from the RO unit is not within the desired range, rotating a mechanical knob of a TDS controller for regulating the TDS level of the RO purified water to a desired level within a

permissible limit defined in the controller unit by blending pre-treated water passed through the TDS controller with the RO purified water for providing the potable output water. And upon determining that the TDS level of the dispensed water from the RO unit is within the desired range, directly dispensing the purified water from the RO unit for drinking. In an additional embodiment, the method further comprising rotating the mechanical knob to its various positions to regulate the TDS level of output water within variable desired band levels.
[0012] In yet another non-limiting embodiment of the present disclosure, said 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 TDS controller through a flow resistor tube (FRT).
[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, transmitting the estimated TDS level of the input water to a server, comparing the estimated TDS level of the input water to the permissible TDS value; shut off the system when the TDS level of the input water reaches above the permissible TDS value.
[0014] In yet another non-limiting embodiment of the present disclosure, the controller
unit of said system is coupled to a booster unit and a potable output water tank, and configured to: sense the level of potable water in the tank and shut the booster unit immediately when the tank is full.
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 manually using mechanical method as per his choice and taste.
[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 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 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 the water quality sensed by the TDS sensor.
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 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, and with reference to the accompanying figures, in which:
[0021] Fig. 1 illustrates a system for mechanically regulating the TDS level of potable
output water, according to various embodiments.
[0022] Figure 2 illustrates an exemplary embodiment of a mechanical knob of the TDS
controller illustrated in Fig. 1 having three different band levels.
[0023] Figure 3 discloses a method for controlling TDS value of potable output water, by
way of flowchart, according to various embodiments.
[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 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 "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 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 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 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.
[0028] Embodiments of the present disclosure relates to a system and a method for
regulating the TDS level of potable output water manually using mechanical 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 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. The system also includes a TDS controller comprising a rotatable mechanical knob, the mechanical knob is manually rotated to regulate the TDS level of the RO purified water to a desired level within a permissible limit defined in the controller unit by blending a pre-treated water passed through the TDS controller with the RO purified water to provide potable output water.
[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 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 disclosure. The following description is, therefore, not to be taken in a limiting sense.
[0030] Figure 1 illustrates system 100 for mechanically controlling the TDS level of
water as per user selection. The system 100 may comprise input unit 102 configured to receive unpurified water from one of municipal cooperation, 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 pre-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 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 RO unit 106.
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 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 in a given embodiment of the disclosure the RO unit 106 is also configured to remove bacteria, virus, protozoa, parasites and reduces Total Dissolved Salts (TDS), hardness, pesticides, heavy metals & fluoride etc. from water. In an alternate embodiment, the RO unit 106 only filters TDS and whereas, the rest of the impurities such as bacteria, virus, protozoa, parasites, hardness, pesticides, heavy metals & fluoride etc. are removed from by some other filter means prior to RO filtration step. The RO system of the present discloser 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 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) 108 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) is an essential component of all the reverse osmosis process. FRT II is used in RO systems at the outlet of reject water to the drain. Flow restrictor blocks the water outflow from the 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 TDS controller or blending dial 112
configured for receiving the stream 2 of pre-treated water from the booster unit 104. Precisely, the TDS controller 112 is configured to receive water from stream 1 coming from the booster unit 104 via a flow restrictor tube I (FRT) 110, wherein the FRT I is designed to limit the pressure of water entering the TDS controller 112. In an embodiment, said TDS controller 112 comprises a mechanical knob which is manually rotatable in clock and anti-clock wise direction to regulate the flow of the stream 2 of the pre-treated water that emanates from the TDS controller 112 to a desired level. Said TDS controller 112 is mechanically controlled using the rotatable knob which is explained in further detail in below paragraphs of the present disclosure. Said system 100 also discloses having a TDS sensor 114 placed at the output of RO unit 106. In an embodiment of the present disclosure, a single TDS sensor 114 is used at the juncture where both water from the TDS controller (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 114 may be configured to sense the TDS level of output water as well as input water based on estimation. The TDS sensor 114 would work on the estimation method by controlling the TDS level of the water in two different cases. In the first case, when 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 114 attached at the output junction would sense the TDS level thus estimating the input water quality and intimating the customer. Similarly, when blending line is open, TDS sensor 114 would be able to measure the TDS level of output water accordingly.
[0034] In order to control/regulate and monitor the TDS level of water in any of the
above discussed scenarios a controller unit 116 is discloses in system 100. Said controller unit 116 is operatively connected to the TDS controller 112 and TDS sensor 114. In an exemplary embodiment, the controller unit 116 is configured to initially measure the TDS level of RO purified water coming from the RO unit 104 when the system is first initialized. Based on measured TDS level the controller unit 116 is configured to estimate the TDS level of input water, as elaborated in first scenarios discussed above. The controller unit 116 is further configured to compare the estimated to the permissible TDS value defined in the controller unit, and may shut off the system when the TDS level of the input water reaches above the

permissible TDS value. In an exemplary embodiment, the controller unit 116 may include at least one of a display unit (not shown) to display the TDS level of the potable output water, a memory unit (not shown) to store the TDS level of the potable output water and at least one communication unit configured to transmit the estimated TDS level of the input water to a server for developing a better understanding of water quality in terms of TDS geographically where it would be used. The data fetched and transmitted through the present invention using communication device would further help in improving the said technology, herein, the elaboration of anticipated improvement methods are beyond the scope of the full disclosure. In another exemplary embodiment, the communication unit may be configured to interact with, in addition to the server, at least one of mobile, laptop, PDA and like user device to relay/transmit the estimated TDS level of the input water.
[0035] Precisely, in an embodiment of the present disclosure, the functioning of the
mechanically controlled TDS selections using the rotation of the mechanical knob of the TDS controller 112 are explained via general example. Although, the number of TDS bands for selection using mechanical TDS controller 112 are not confined to any certain number but for general understanding, let's consider three TDS bands are available and specified as X, Y & Z, as directed in Figure 2, wherein selection X sets up the lower permissible TDS band in potable water, selection Z sets up the higher permissible TDS band in potable water whereas selection Y chooses for moderately permissible TDS band in water.
[0036] Mechanical TDS controller 112 may be operated by rotating it in both clockwise
and anti-clockwise position. In fully closed condition, this is when the mechanical TDS controller can't be rotated anti-clockwise position further, the TDS value of the output water reaching to the tank would be in lower range. Oppositely in full opened condition, this is when the mechanical TDS controller can't be rotated clockwise position any further, the TDS value of the output water reaching to the tank would be in higher range and thus, TDS would be in medium range if the mechanical TDS controller is in middle position where its free to move on either side equally.
[0037] Now, let us consider if the mechanical TDS controller 112 is in fully closed

condition and the water purifier is connected to raw input water source. As shown in figure 1, the water will flow through to the booster pump and since the mechanical TDS controller (blending dial) is in fully closed condition, only stream 2 water will flow though to TDS sensor which will detect the TDS value of output water. Based on this value, the controller unit will determine if the TDS value is above permissible limit. If the TDS value is above the permissible TDS limit, the system will understand that the input water quality is poor and thus, may stop the water purifier functioning. However, if the TDS value of output water is determined low, then mechanical TDS controller can be operated by rotating in clockwise direction to attain upper range in X band or anywhere in Y or Z band. As the mechanical TDS controller is rotated clockwise slowly, the stream 1 will also be opened allowing water to pass through gradually and gets blended with stream 2 water. This phenomenon will increase the TDS value of output water after blending. Similarly, the flow of stream 1 will be increased as the mechanical TDS controller is further rotated in clock wise position.
[0038] As shown in the Figure 2,
o There will be no water flowing in stream 1 at Fully closed condition
o Percentage of water passing through stream 1 will be more in Y band level than in X
band
o Similarly, percentage of water passing through stream 1 will be more in Z band than Y
and X
[0039] Therefore, TDS level of output water will increase gradually as mechanical TDS
controller moves from fully closed condition to fully open condition. So, it will be reasonable to understand that TDS value in Z band> Y band> X band as mechanical TDS controller is rotated clockwise from fully closed position.
[0040] Thus, Mechanical TDS controller 112 balances the taste of water by allowing the
percentage of mixing by intelligently monitoring the TDS value of output water. At any point where mechanical TDS controller stops, user can taste the output water on that particular TDS band by pressing the dispense option on control panel and save it if it's according to their taste

preference. The mechanical TDS controller would be, but not confined to, provided on the front panel of the water purifier for the user.
[0041] The TDS sensor 114 placed inside purification system is a key component that
reads the data and outlines logic in controller unit for the different TDS band levels. Direct exposure of this device to input water may cause the deposition of salts on the probe which could create malfunctioning in this device, thus create adverse results. Thus, the present invention uses the TDS sensor 114 to sense the TDS of output water (purified) which are free from excessive salts and provide longevity to the device.
[0042] Figure 3 discloses a method, illustrating by the way of a flow chart, for regulating
the TDS level of potable output water implemented in the mechanical TDS control system (100) described in Figure 2. 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. At next step 306, water splits into two different streams, with high pressure, from the output of the booster unit 104. 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 308, the method discloses sending stream 2 of pre-treated water to the RO unit 106 for purifying pre-treated input water to provide RO purified water. Simultaneously at step 310, the method discloses sending stream 1 of pre-treated input water to FRT1 110 from where it is received by the TDS controller 112.
[0043] The method 300 further discloses, at step 312 the TDS level of RO purified water
is measured using a TDS sensor 114. Based on this measurement, the controller unit 116 may then estimate the TDS level of input water at step 314. Further, as shown at step 315, the user determines whether the measured TDS level of the dispensed water from the RO unit is within a desired range pre-set by a user. If the result/answer is "YES", then as indicated at step 317, then user may collect the purified water directly dispensed from the RO unit for drinking without further rotating the mechanical knob. However, in the above determination step, if the answer is

"NO", then as indicated at step 316, user may rotate a mechanical knob of a TDS controller to a desired level so that controlled flow of output water stream (steam 1) from the TDS controller blends with the RO purified water and thereby regulating/adjusting the TDS level of the RO purified water to a desired level within a permissible limit defined in the controller unit for providing the potable output water of the user choice.
[0044] 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.

We claim:
1. A mechanical TDS control system comprising:
a reverse osmosis (RO) unit configured to provide RO purified water by reducing TDS level of an input water;
a TDS sensor configured to measure the TDS level of RO purified water when the system is initialized;
a controller unit operably connected to the TDS sensor, wherein the controller unit is configured to estimate the TDS level of the input water based on the TDS level of the RO purified water; and
a TDS controller comprising a rotatable mechanical knob, the mechanical knob is manually rotated to regulate the TDS level of the RO purified water to a desired level within a permissible limit defined in the controller unit by blending a pre-treated water passed through the TDS controller with the RO purified water to provide potable output water.
2. The system as claimed in claim 1, wherein the mechanical knob is rotatable manually to its various positions to regulate the TDS level of output water within variable desired band levels.
3. The system as claimed in claim 1, further comprises: 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 RO unit for RO purification and the other steam is sent to the TDS controller though a flow restrictor tube (FRT).
4. 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 communication unit configured to transmit the estimated TDS level of the input water to a server,
wherein the controller unit further configured to:

compare the estimated TDS level of the input water to the permissible TDS value defined in the controller unit; and
shut off the system when the TDS level of the input water reaches above the permissible TDS value.
5. 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 when the tank is full.
6. A water purification 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, when the method is initialized;
estimating, by a controller unit, TDS level of the input water based on the TDS level of RO purified water; and
determining whether the measured TDS level of the dispensed water from the RO unit is within a desired range set by a user;
upon determining that the TDS level of the dispensed water from the RO unit is not within the desired range, rotating a mechanical knob of a TDS controller for regulating the TDS level of the RO purified water to a desired level within a permissible limit defined in the controller unit by blending pre-treated water passed through the TDS controller with the RO purified water for providing the potable output water;
upon determining that the TDS level of the dispensed water from the RO unit is within the desired range, directly dispensing the purified water from the RO unit for drinking.
7. Method as claimed in claim 6, further comprising rotating the mechanical knob to its
various positions to regulate the TDS level of output water within variable desired band
levels.

8. The method as claimed in claim 6, further comprises:
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 TDS controller through a flow restrictor tube (FRT).
9. The method as claimed in claim 6, wherein the controller unit further configured to:
display the TDS level of the potable output water
store the TDS level of the potable output water; and
transmit the estimated TDS level of the input water to a server;
compare the estimated TDS level of the input water to the permissible TDS value; and
shut off the system when the TDS level of the input water reaches above the permissible
TDS value.
10. The method as claimed in claim 6, wherein the controller unit is coupled to a booster unit
and a potable output water tank, and configured to:
sense the level of potable water in the tank and
shut the booster unit immediately when the tank is full.