CN220887125U - Pure water film-washing water purifier with pressure tank - Google Patents
Pure water film-washing water purifier with pressure tank Download PDFInfo
- Publication number
- CN220887125U CN220887125U CN202322286982.2U CN202322286982U CN220887125U CN 220887125 U CN220887125 U CN 220887125U CN 202322286982 U CN202322286982 U CN 202322286982U CN 220887125 U CN220887125 U CN 220887125U
- Authority
- CN
- China
- Prior art keywords
- water
- pressure tank
- pure water
- filter element
- reverse osmosis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 238000005406 washing Methods 0.000 title claims abstract description 9
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 64
- 239000012528 membrane Substances 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 239000002351 wastewater Substances 0.000 claims abstract description 15
- 239000008399 tap water Substances 0.000 claims description 11
- 235000020679 tap water Nutrition 0.000 claims description 11
- 238000011045 prefiltration Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 abstract description 5
- 230000003204 osmotic effect Effects 0.000 abstract description 3
- 239000008213 purified water Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a pure water membrane washing water purifier with a pressure tank, which comprises a reverse osmosis filter element, a booster pump, the pressure tank and a water tap, wherein the reverse osmosis filter element is provided with a water inlet channel, a waste water channel and a pure water channel; the raw water pipeline is provided with a first electromagnetic valve, the air supply pipeline is provided with a second electromagnetic valve, and the cleaning pipeline is provided with a third electromagnetic valve. The pure water membrane washing water purifier with the pressure tank ensures the purity of the head cup water, does not produce high-concentration impurity water body by osmotic balance, and prolongs the service life of the reverse osmosis filter element.
Description
Technical Field
The utility model relates to a pure water film-washing water purifier with a pressure tank, and belongs to the technical field of water purifier equipment.
Background
The reverse osmosis filter membrane is a core filter membrane for purifying water of the water purifier, and raw water can be filtered through the reverse osmosis filter membrane to obtain pure water.
However, when the water purifier is stopped, the pressure in front of the membrane is reduced, and the phenomenon of osmotic balance can occur between the low-concentration pure water end and the high-concentration raw water end until the concentrations at the two sides are balanced, so that the concentration of the pure water end becomes high, and the first cup of water taken by a user is the head cup of water with higher impurity concentration.
The existing water purifier solves the problem of head cup water in a pure water soaking mode, specifically, after the water purifier stops working, pure water is filled into a reverse osmosis membrane cavity, and the purpose is that both sides of the membrane are pure water.
However, before purified water is filled, the whole inner membrane of the reverse osmosis membrane cavity is fully filled with raw water, and the raw water is directly replaced by the purified water, so that the condition that two concentrations of water are mixed can occur, and the phenomenon of incomplete soaking can be caused.
For the above reasons, further studies on the existing water purifier are necessary in order to solve the above problems.
Disclosure of utility model
In order to overcome the above problems, the present inventors have conducted intensive studies and have proposed a pure water membrane-washing water purifier having a pressure tank, which includes a reverse osmosis cartridge having a water inlet passage, a wastewater passage, and a pure water passage, a booster pump having a rear end connected to the reverse osmosis cartridge water inlet passage, a pure water passage connected to the pressure tank and the water tap,
The front end of the booster pump is provided with a raw water pipeline, a cleaning pipeline and an air supply pipeline, wherein the raw water pipeline is connected with tap water, the cleaning pipeline is connected with the pressure tank, and the air supply pipeline is connected with air;
Be provided with first solenoid valve on raw water pipeline, be provided with the second solenoid valve on the air supply pipeline, be provided with the third solenoid valve in wasing the pipeline for:
When the first electromagnetic valve is opened, the second electromagnetic valve is closed, the third electromagnetic valve is closed, and the water tap is opened, the booster pump can pump tap water to the reverse osmosis filter element to filter raw water, so that pure water is obtained and discharged through the water tap;
When the first electromagnetic valve is opened, the second electromagnetic valve is closed, the third electromagnetic valve is closed, and the water tap is closed, the booster pump can pump tap water to the reverse osmosis filter element to filter raw water, obtain pure water and inject the pure water into the pressure tank;
After the first electromagnetic valve is closed, the second electromagnetic valve is opened, the third electromagnetic valve is closed and the water tap is closed, the booster pump can pump air to the reverse osmosis filter core to empty raw water in the cavity of the reverse osmosis filter core;
after the first electromagnetic valve is closed, the second electromagnetic valve is closed, the third electromagnetic valve is opened, and the water tap is closed, the booster pump can pump pure water in the pressure tank to the reverse osmosis filter core to fill the cavity of the reverse osmosis filter core.
In a preferred embodiment, an air bag is provided in the pressure tank, the air bag being closed with a gas therein.
In a preferred embodiment, a high pressure switch is provided between the pressure tank and the reverse osmosis cartridge pure water passage.
In a preferred embodiment, a one-way valve is provided between the pressure tank and the pure water passage of the reverse osmosis cartridge to prevent pure water in the pressure tank from flowing to the reverse osmosis cartridge.
In a preferred embodiment, an air filter element is arranged in the air supply line.
In a preferred embodiment, one-way valves are provided in the purge line and the supply line so that the body of water cannot flow along the line to the air or pressure tank.
In a preferred embodiment, a pre-filter is arranged on the raw water line.
In a preferred embodiment, a waste-water control valve is provided in the waste-water channel.
In a preferred embodiment, a temperature sensor is provided on the raw water line.
In a preferred embodiment, a raw water flow meter is provided in the raw water line, and a pure water flow meter is provided in the pure water passage.
The utility model has the beneficial effects that:
(1) The purity of the cup water is ensured, and high-concentration impurity water body produced by osmotic balance cannot occur;
(2) The reverse osmosis filter element is soaked in pure water all the time after working, and crystallization is not easy to occur, so that the service life of the reverse osmosis filter element is prolonged;
(3) The use of the pressure tank avoids pollution of pure water, reduces the use of the electromagnetic valve, saves the cost and reduces the volume of the device.
Drawings
Fig. 1 shows a schematic structure of a pure water membrane-washing water purifier having a pressure tank according to a preferred embodiment of the present utility model.
Reference numerals illustrate:
1-a reverse osmosis filter element;
2-a booster pump;
3-a pressure tank;
5-an air filter element;
6-a one-way valve;
8-a waste water regulating valve;
9-a tap;
31-an air bag;
41-a first solenoid valve;
42-a second solenoid valve;
43-a third solenoid valve;
44-high voltage switch;
71-a pre-filter element;
72-a temperature detector;
73-a raw water flowmeter;
74-pure water flowmeter;
75-TDS sensor.
Detailed Description
The utility model is further described in detail below by means of the figures and examples. The features and advantages of the present utility model will become more apparent from the description.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The pure water membrane washing water purifier with the pressure tank comprises a reverse osmosis filter element 1, a booster pump 2, the pressure tank 3 and a water tap 9, wherein the reverse osmosis filter element 1 is provided with a water inlet channel, a waste water channel and a pure water channel, the rear end of the booster pump 2 is connected with the water inlet channel of the reverse osmosis filter element 1, the pure water channel of the reverse osmosis filter element 1 is connected with the pressure tank 3 and the water tap 9, as shown in figure 1,
The front end of the booster pump 2 is provided with a raw water pipeline, a cleaning pipeline and an air supply pipeline, wherein the raw water pipeline is connected with tap water, the cleaning pipeline is connected with the pressure tank 3, and the air supply pipeline is connected with air;
A first solenoid valve 41 is provided on the raw water line, a second solenoid valve 42 is provided on the air supply line, and a third solenoid valve 43 is provided in the purge line such that:
After the first electromagnetic valve 41 is opened, the second electromagnetic valve 42 is closed, the third electromagnetic valve 43 is closed, and the water tap 9 is opened, the booster pump 2 can pump tap water to the reverse osmosis filter element 1 to filter raw water, obtain pure water and discharge the pure water through the water tap 9;
After the first electromagnetic valve 41 is opened, the second electromagnetic valve 42 is closed, the third electromagnetic valve 43 is closed and the water tap 9 is closed, the booster pump 2 can pump tap water to the reverse osmosis filter element 1 to filter raw water, obtain pure water and inject the pure water into the pressure tank 3;
after the first electromagnetic valve 41 is closed, the second electromagnetic valve 42 is opened, the third electromagnetic valve 43 is closed and the water tap 9 is closed, the booster pump 2 can pump air to the reverse osmosis filter element 1 to empty raw water in the cavity of the reverse osmosis filter element 1;
After the first solenoid valve 41 is closed, the second solenoid valve 42 is closed, the third solenoid valve 43 is opened, and the water tap 9 is closed, the booster pump 2 can pump pure water in the pressure tank to the reverse osmosis filter element 1 to fill the cavity of the reverse osmosis filter element 1.
According to the present utility model, when the user uses purified water, after the first solenoid valve 41 is opened, the second solenoid valve 42 is closed, the third solenoid valve 43 is closed, and the water tap 9 is opened, the booster pump 2 pumps tap water to the reverse osmosis filter element 1 to filter raw water, and the purified water obtained by filtration is discharged from the water tap 9;
When the user stops using the pure water, the water tap 9 is closed, the first electromagnetic valve 41 is kept open, the second electromagnetic valve 42 is closed, the third electromagnetic valve 43 is kept closed, the booster pump 2 continues to pump tap water to the reverse osmosis filter element (1) for filtering raw water, the obtained pure water is injected into the pressure tank 3, and the pressure tank 3 is filled with the pure water;
When the pressure tank 3 is full of water and the reverse osmosis filter element 1 is required to stop raw water filtration, at the moment, the water tap 9 maintains a closed state, the first electromagnetic valve 41 is closed, the second electromagnetic valve 42 is opened, the third electromagnetic valve 43 is closed, the booster pump 2 pumps air to the reverse osmosis filter element 1, raw water in the cavity of the reverse osmosis filter element 1 is emptied, and in the discharging process, the reverse osmosis filter element 1 cannot continuously fill the pressure tank 3 with pure water because the pressure tank 3 is filled with pure water, and the raw water in the cavity of the reverse osmosis filter element 1 can be completely discharged into a waste water channel;
After the raw water in the cavity of the reverse osmosis filter element 1 is emptied, the tap 9 maintains a closed state, the first electromagnetic valve 41 is closed, the second electromagnetic valve 42 is closed, the third electromagnetic valve 43 is opened, pure water in the pressure tank 3 is discharged under the pressure effect, the booster pump 2 pumps the pure water to the reverse osmosis filter element 1, and the cavity of the reverse osmosis filter element 1 is filled, so that all the pure water in front of the membrane of the reverse osmosis filter element 1 is purified water, and the concentration of the immersed pure water impurity is lower compared with the mode of mixing the pure water with the raw water before filling, so that the effect of solving the drinking cup water is better.
In a preferred embodiment, an air bag 31 is provided in the pressure tank 3, and the pressure in the tank is regulated by compressing and relaxing the air bag 31, so that the pressure in the tank increases with the increase of the stored water amount.
In a preferred embodiment, a high pressure switch 44 is provided between the pressure tank 3 and the pure water passage of the reverse osmosis cartridge 1. As the amount of pure water in the pressure tank 3 increases, the pressure between the pressure tank 3 and the pure water passage of the reverse osmosis cartridge 1 increases, and when the pressure reaches a preset pressure, the high-pressure switch 44 generates a signal indicating that pure water is stored in the pressure tank 3.
The use of the pressure tank 3 utilizes the high-pressure air bag inside the pressure tank to reversely push pure water out of the pressure tank, does not need to be an air inlet and exhaust structure, avoids the pure water from being polluted, and utilizes the pressure characteristic without arranging an electromagnetic valve between the pressure tank 3 and a pure water channel of the reverse osmosis filter element 1, thereby saving the cost and reducing the volume of the device.
In a preferred embodiment, a one-way valve 6 is provided between the pressure tank 3 and the pure water channel of the reverse osmosis cartridge 1, preventing pure water in the pressure tank 3 from flowing to the reverse osmosis cartridge 1.
According to the utility model, the storage volume of the pressure tank 3 is larger than the volume of the reverse osmosis filter core cavity so as to ensure that pure water can fill the reverse osmosis filter core cavity.
In a preferred embodiment, an air filter 5 is provided in the air supply line for filtering air entering the water purifier to maintain the inside of the water purifier in a clean state.
In a preferred embodiment, one-way valves 6 are provided in the purge line and the supply line so that the body of water cannot flow along the line to the air or pressure tank.
In a preferred embodiment, a pre-filter 71 is provided on the raw water line, and large-particle impurities are preliminarily filtered through the pre-filter 71. The pre-filter element is a common filter element of the water purifier, the specific material or model of the pre-filter element is not limited in the utility model, and the pre-filter element can be freely selected by a person skilled in the art according to the needs, for example, an activated carbon filter element, a coconut shell filter element, a PP cotton filter element or a combination of a plurality of filter elements is adopted.
In a preferred embodiment, a waste water control valve 8 is provided in the waste water channel, and the purification effect is controlled by adjusting the pure waste ratio of the reverse osmosis filter cartridge 1 by means of the waste water control valve 8.
In a preferred embodiment, a temperature detector 72 is provided on the raw water line for detecting the temperature of raw water and adjusting the opening degree of the waste water regulating valve according to the temperature, thereby ensuring the quality of pure water.
In a preferred embodiment, a TDS sensor 75 is further provided on the raw water management for detecting the TDS value of the raw water, and the opening degree of the wastewater regulating valve is adjusted according to the TDS value of the raw water, thereby ensuring the quality of pure water.
In a preferred embodiment, the water purifier further has a tap 9 connected to the pressure tank 3 or to a connection pipe of the pure water passage and the pressure tank 3.
In a preferred embodiment, a raw water flow meter 73 is provided on the raw water pipeline, and a pure water flow meter 74 is provided on the pure water channel for monitoring the pure waste ratio of the reverse osmosis filter cartridge 1 and assisting the water purifier in reminding the life of the filter cartridge.
In the description of the present utility model, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "front", "rear", etc. are based on the positional or positional relationship in the operation state of the present utility model, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The utility model has been described above in connection with preferred embodiments, which are, however, exemplary only and for illustrative purposes. On this basis, the utility model can be subjected to various substitutions and improvements, and all fall within the protection scope of the utility model.
Claims (10)
1. The pure water membrane washing water purifier with the pressure tank is characterized by comprising a reverse osmosis filter element (1), a booster pump (2), a pressure tank (3) and a water tap (9), wherein the reverse osmosis filter element (1) is provided with a water inlet channel, a waste water channel and a pure water channel, the rear end of the booster pump (2) is connected with the water inlet channel of the reverse osmosis filter element (1), the pure water channel of the reverse osmosis filter element (1) is connected with the pressure tank (3) and the water tap (9),
The front end of the booster pump (2) is provided with a raw water pipeline, a cleaning pipeline and an air supply pipeline, wherein the raw water pipeline is connected with tap water, the cleaning pipeline is connected with the pressure tank (3), and the air supply pipeline is connected with air;
A first solenoid valve (41) is provided on the raw water line, a second solenoid valve (42) is provided on the air supply line, and a third solenoid valve (43) is provided in the purge line such that:
when the first electromagnetic valve (41) is opened, the second electromagnetic valve (42) is closed, the third electromagnetic valve (43) is closed, and the water tap (9) is opened, the booster pump (2) can pump tap water to the reverse osmosis filter element (1) to filter raw water, so that pure water is obtained and discharged through the water tap (9);
When the first electromagnetic valve (41) is opened, the second electromagnetic valve (42) is closed, the third electromagnetic valve (43) is closed, and the water tap (9) is closed, the booster pump (2) can pump tap water to the reverse osmosis filter element (1) to filter raw water, pure water is obtained and injected into the pressure tank (3);
After the first electromagnetic valve (41) is closed, the second electromagnetic valve (42) is opened, the third electromagnetic valve (43) is closed and the water tap (9) is closed, the booster pump (2) can pump air to the reverse osmosis filter element (1) to empty raw water in the cavity of the reverse osmosis filter element (1);
After the first electromagnetic valve (41) is closed, the second electromagnetic valve (42) is closed, the third electromagnetic valve (43) is opened, and the water tap (9) is closed, the booster pump (2) can pump pure water in the pressure tank to the reverse osmosis filter element (1) so as to fill the cavity of the reverse osmosis filter element (1).
2. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
An airbag (31) is provided in the pressure tank (3), and the airbag (31) is sealed and contains gas therein.
3. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
A high-pressure switch (44) is arranged between the pressure tank (3) and the pure water channel of the reverse osmosis filter element (1).
4. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
A one-way valve (6) is arranged between the pressure tank (3) and the pure water channel of the reverse osmosis filter element (1) to prevent pure water in the pressure tank (3) from flowing to the reverse osmosis filter element (1).
5. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
An air filter element (5) is arranged on the air supply pipeline.
6. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
The cleaning pipeline and the air supply pipeline are provided with one-way valves (6) so that water cannot flow to the air or the pressure tank along the pipeline.
7. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
A pre-filter element (71) is arranged on the raw water pipeline.
8. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
A waste water regulating valve (8) is arranged on the waste water channel.
9. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
A temperature detector (72) is provided in the raw water line.
10. The pure water membrane cleaning water purifier with a pressure tank as claimed in claim 1,
A raw water flowmeter (73) is provided in the raw water pipeline, and a pure water flowmeter (74) is provided in the pure water channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322286982.2U CN220887125U (en) | 2023-08-24 | 2023-08-24 | Pure water film-washing water purifier with pressure tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322286982.2U CN220887125U (en) | 2023-08-24 | 2023-08-24 | Pure water film-washing water purifier with pressure tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220887125U true CN220887125U (en) | 2024-05-03 |
Family
ID=90869207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322286982.2U Active CN220887125U (en) | 2023-08-24 | 2023-08-24 | Pure water film-washing water purifier with pressure tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220887125U (en) |
-
2023
- 2023-08-24 CN CN202322286982.2U patent/CN220887125U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214299540U (en) | Pure water backflow water purification system | |
| CN214936463U (en) | Water purifier | |
| CN220887125U (en) | Pure water film-washing water purifier with pressure tank | |
| CN213707901U (en) | Water purifier | |
| CN220723625U (en) | Water purifier with filter membrane function is washd to pure water | |
| CN218435432U (en) | Water drive jar pure water film cleaning system | |
| CN214734901U (en) | Desktop formula purifier | |
| CN216737790U (en) | Water purifier waterway structure | |
| CN205084634U (en) | Milipore filter washing unit and have device's water purifier | |
| CN212799750U (en) | Water path structure for providing pure water for raw water side of RO (reverse osmosis) membrane filter element | |
| CN215102440U (en) | Multifunctional mineralized waterway system | |
| CN214611834U (en) | Water purifier | |
| CN209835852U (en) | Water treatment system and water purification equipment | |
| CN209853857U (en) | Water purifier waterway system | |
| CN112499795A (en) | Water purification system | |
| CN208732760U (en) | Purifier | |
| CN216191270U (en) | Hybrid water purification system | |
| CN210065337U (en) | Water purifying equipment | |
| CN219297326U (en) | Domestic water purifying equipment | |
| CN218893542U (en) | RO membrane filter core with scale inhibition structure | |
| CN220887034U (en) | Water purifier | |
| CN220056462U (en) | Water purification system | |
| CN2499386Y (en) | Pipeline type water purifier | |
| CN219117188U (en) | Filtration system of single electric adsorption filter core and water purification unit applying same | |
| CN217614028U (en) | Reduce reverse osmosis water purification system of first cup water TDS |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |