KR101627707B1 - Multi Filtration Equipment - Google Patents

Multi Filtration Equipment Download PDF

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Publication number
KR101627707B1
KR101627707B1 KR1020150103613A KR20150103613A KR101627707B1 KR 101627707 B1 KR101627707 B1 KR 101627707B1 KR 1020150103613 A KR1020150103613 A KR 1020150103613A KR 20150103613 A KR20150103613 A KR 20150103613A KR 101627707 B1 KR101627707 B1 KR 101627707B1
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KR
South Korea
Prior art keywords
steam
filter medium
raw water
main body
filter
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KR1020150103613A
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Korean (ko)
Inventor
김희곤
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김희곤
선일이씨티 주식회사
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Priority to KR1020150103613A priority Critical patent/KR101627707B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • B01D24/4636—Counter-current flushing, e.g. by air with backwash shoes; with nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B01D24/14—Downward filtration, the container having distribution or collection headers or pervious conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • B01D24/4642—Counter-current flushing, e.g. by air with valves, e.g. rotating valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
    • B01D24/4807—Handling the filter cake for purposes other than regenerating
    • B01D24/4815—Handling the filter cake for purposes other than regenerating for washing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

A multi-filtration apparatus for purifying raw water by a filter medium composed of gravel, sand, activated carbon, and carbon by a plurality of activated carbon layers, the multi-filtration apparatus comprising: a main body in which the filter medium is laminated in a plurality of layers; A raw water supply unit for supplying raw water to be filtered to the laminated filter medium inside the main body; An air compressor for controlling the plurality of valves so that supply and shut-off of raw water to the filter medium, supply of steam and shut-off of the steam are performed; And a steam generator for spraying high temperature steam to the filter medium when the filter medium inside the main body is clogged due to impurities or slimness to heat the filter medium to a high temperature and then to supply steam for cleaning the filter medium by fine bubbles The filter material is washed so that the foreign substances fixed on the surface of the filter material are separated from the filter material to maintain optimal filtration efficiency and can be used semi-permanently without replacing the filter material and the filter material is heated by the high temperature steam supplied from the steam generator Cleaning and backwashing at a high temperature can be repeated periodically and repeatedly, so that the filter material can be maintained in the initial charged state, thereby improving the filtration efficiency.

Figure R1020150103613

Description

Multi Filtration Equipment

The present invention relates to a multi-filtration apparatus, and more particularly, to a multi-filtration apparatus capable of purifying raw water with a filter material such as activated carbon and cleaning the activated carbon layer with a supplied micro-filter by heating the activated carbon layer.

In recent years, the problem of water shortage has arisen, and raw water such as rainwater or polluted water has been cleaned and treated in a multi-filtration apparatus without disposal to clean water that can be reused and used economically.

Raw water obtained by such a multi-filtration apparatus is filtered and used as purified water in the process of passing the filter medium.

Since the filter medium is made of activated carbon, sand and gravel, the water is filtered during the passage of the filter medium. Since the foreign materials are fixed after the filter medium is used for a certain period of time, .

For example, the replacement cycle of activated carbon is about 6 months, and sand and gravel are about 1 year.

An example of such a multi-filtration device is disclosed in Korean Patent Laid-Open Publication No. 10-2012-0033095 (published on Apr. 06, 2012, hereinafter referred to as "Patent Document 1").

However, such a conventional multi-filtration device has a problem in that the operation of replacing the filter medium is troublesome and the operation cost is increased because the filter medium is separately cleaned and the washed filter medium is supplied once again.

Also, before the filter medium is periodically replaced, the filter medium is washed or backwashed. Since a large amount of water is consumed at each time, water and sewage charges, the cost of chemicals put in the water, There is a problem in that various various costs including the cost can be increased.

The multi-filtration apparatus disclosed in Patent Document 1 is registered as a patent registration No. 10-1216133 by the applicant of the present invention, and there is a problem that filtration efficiency is lowered due to accumulation of suspended substances in the activated carbon layer contained in the main body.

For example, Patent Document 1 below discloses a "multi-filtration device".

The multi-filtration apparatus according to the following Patent Document 1 is provided with a main body having a filter medium stacked therein, the multi-filtration apparatus being provided with purifying raw water by a filter medium such as activated carbon. A plurality of nozzle cleaners provided in the main body along a direction in which the filter media are stacked so that high-pressure cleaning water is injected into the main body from the filter medium; And a plurality of heating and desorbing units provided between the nozzle washing units in the main body to separate and remove foreign matter adsorbed on the filter material by heating the filter material stacked in the main body, A cleaning pipe provided along the transverse direction of the direction in which the filter media are stacked in the inside and cleaning nozzles provided at the upper and lower sides along the longitudinal direction of the cleaning pipe.

The cleaning pipe is provided in an annular ring shape corresponding to the inner circumferential surface shape of the main body. The inner pipe provided in the main body of the main body has a water filter and a raw water supply unit connected to the main body to supply raw water. An air compressor for providing a pressure to open and close the respective valves provided in the main body; a sensing unit provided in the water tank of the raw water supply unit to sense the level of raw water collected in the water tank; And a control unit for controlling the raw water supply unit, the air compressor, and the heat removal unit based thereon.

Korea Patent Registration No. 10-1216133 (Registered on December 20, 2012)

However, the conventional multi-filtration apparatus has a problem that the activated carbon layer stored in the main body can not be cleaned, clogging occurs due to impurities in the activated carbon, and the pores of the activated carbon layer are clogged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-filtration device capable of increasing filtration efficiency by cleaning an activated carbon layer such as gravel and sand with high temperature and high pressure.

Another object of the present invention is to provide a multi-filtration device which can continuously use the activated carbon layer without separating or replacing the activated carbon layer by washing the activated carbon layer stacked in the main body with steam.

In order to achieve the above object, a multi-filtration apparatus according to the present invention is a multi-filtration apparatus for purifying raw water by gravel, sand, activated carbon, and a filter material composed of a plurality of activated carbon layers by carbon, A body stacked in multiple layers; A raw water supply unit for supplying raw water to be filtered to the laminated filter medium inside the main body; An air compressor for controlling the plurality of valves so that supply and shut-off of raw water to the filter medium, supply of steam and shut-off of the steam are performed; And a steam generator for spraying high-temperature steam to the filter medium when the filter medium inside the main body is clogged due to impurities or slimness, thereby heating the filter medium to a high temperature and then supplying steam to clean the filter medium by fine bubbles And a cleaning step of periodically removing foreign matter remaining in the filter material by filtration of raw water supplied by the raw water supply unit and high temperature steam supplied from the steam generator.

An air hose is connected between the main body and the air compressor so that air is supplied from the air compressor. A steam hose is connected between the main body and the steam generator so that steam is supplied from the steam generator, and the air hose and the steam hose A ball valve for opening and closing the air supplied from the air compressor and a ball valve for opening and closing the steam supplied from the steam generator are installed and the air hose and the steam hose are joined together at one nozzle cleaning part, Characterized in that air or steam is selectively injected.

The nozzle cleaning unit is spirally installed to supply air or steam to the filter media stacked inside the main body, and the nozzle cleaning unit is formed with a plurality of holes at regular intervals such that air or steam is sprayed at a high pressure .

An external pipe connected to the raw water supply unit such that raw water to be filtered is supplied to the main body; And a plurality of valves installed to selectively open and close the raw water supplied through the external pipe.

As described above, according to the multi-filtration apparatus of the present invention, it is possible to maintain the optimum filtration efficiency by washing the filter medium so that the foreign matter fixed on the surface of the filter medium is separated from the filter medium, The filter can be cleaned by heating the filter material with high temperature steam supplied from the steam generator, and the filter material can be maintained in the initial charged state by repeating the washing and backwashing at a high temperature periodically, so that the filtration efficiency can be increased Loses.

Further, according to the multi-filtration apparatus of the present invention, the filter medium can be used semi-permanently, the replacement work of the filter medium is not required, the cost for replacing the filter medium is not generated, The number of times of washing or backwashing with water can be reduced and filtration efficiency can be increased and the consumption of water to be used can be reduced.

1 is a view illustrating a multi-filtration apparatus according to a preferred embodiment of the present invention.
2 is a cross-sectional view of a multi-filtration apparatus according to a preferred embodiment of the present invention,
FIG. 3 is an enlarged sectional view showing a state in which a supply pipe of a multi-filtration apparatus according to a preferred embodiment of the present invention is installed,
4 is a plan sectional view showing a supply pipe of a multi-filtration apparatus according to a preferred embodiment of the present invention.

Hereinafter, a multi-filtration apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view illustrating a multi-filtration apparatus according to a preferred embodiment of the present invention. FIG. 3 is a cross-sectional view of a multi-filtration apparatus according to a preferred embodiment of the present invention. Fig. 3 is an enlarged cross-sectional view showing a state where a supply pipe of a multi-filtration device is installed.

A multi-filtration apparatus according to a preferred embodiment of the present invention is a multi-filtration apparatus 10 for purifying raw water by a filter medium 21 composed of a plurality of activated carbon layers by gravel, sand, activated carbon, A body 20 in which a plurality of layers are stacked; A raw water supply part (30) for supplying raw water to be filtered to the filter material (21) inside the main body (20); An air compressor (40) for controlling the plurality of valves so as to supply and shut off the raw water to the filter medium (21) or supply and cut off the steam; When the filter medium 21 in the main body 20 is clogged due to impurities or slimness, hot steam is sprayed to the filter medium 21 to heat the filter medium 21 to a high temperature, And a steam generator 50 for supplying steam to the steam generator 50. The steam generator 50 filters the raw water supplied by the raw water supplier 30 and the high temperature steam supplied from the steam generator 50, 21 are removed periodically.

The multi-filtration apparatus according to the embodiment of the present invention not only filters the raw water supplied from the raw water supply unit 30 by the filter material 21 laminated in the main body 20 but also by the steam generated from the steam generator 50 The filtration efficiency of the filter material 21 is increased by cleaning the filter material 21 blocked by remaining impurities or slim.

As shown in FIGS. 1 to 3, the multi-filtration apparatus 10 according to the embodiment of the present invention adsorbs organic materials, chromaticity components, residual chlorine, etc. mixed in raw water with a filter material 21 such as activated carbon The filter medium 21 used in the multi-filtration apparatus 10 has a function of filtering suspended solids and fine solid substances in raw water as well as adsorption ability of organic substances and residual chlorine, and is used for a certain period of time The filter 20 periodically discharges the foreign matter through the backwashing operation for discharging the foreign matter collected between the filter materials 21 to the outside of the main body 20. [

On the other hand, as shown in FIG. 2, a filter base plate is installed in the lower part of the main body 20, and a plurality of holes are formed in the filter base plate. In the filtration treatment, A plurality of strainers 22 are installed so as to be filtered.

On the upper portion of the strainer 22, a gravel layer, a sand layer, an activated carbon layer or a carbon layer, which is a filter medium 21, are stacked in order with a predetermined height.

1, a raw water supply unit 30 for supplying raw water to the outside of the main body 20 through a pump 31 is provided.

Between the main body 20 and the raw water supply unit 30 is provided an external pipe 32 supplied and circulated to the inside of the main body 20 and an upper pipe 33 branched upward from the external pipe 32, And a lower pipe 34 branched down from the outer pipe 22 is provided.

An inner pipe 35 connected to the upper pipe 33 is provided in the upper portion of the main body 20 and a first valve 36a, a second valve 36b, a third valve 36c, a fourth valve 36d, and a fifth valve 36e, respectively.

The first valve 36a, the second valve 36b, the third valve 36c, the fourth valve 36d and the fifth valve 36e may be provided as electric valves.

The first valve 36a and the fourth valve 36d are opened while the remaining valves 36b, 36c and 36e are closed so that the raw water flows through the inner pipe 35 Is filtered through the filter material 21 and then discharged to the lower portion through the strainer 22 so that the raw water is filtered by the multi filtration device 10 and purified by purified water .

The second valve 36b and the third valve 36c are opened and the remaining valves 36a and 36d are opened when the foreign substances collected between the filter media 21 are discharged to the outside of the main body 20 And 36e are closed so that the washing water introduced through the lower portion of the main body 20 expands the activated carbon and the foreign substance through the strainer 21 and then passes foreign matter having a specific gravity through the internal pipe 35 to the outside of the main body 20 It can be discharged.

The first valve 36a and the fifth valve 36e are opened and the remaining valves are closed to completely remove residual suspended solids in the water existing in the interior of the main body 20 before the filtration operation is performed after the backwash operation, (21) can be stabilized.

2, the inner pipe 35 is provided with a water filter 35a, and the raw water flowing into the interior of the multi-filtering apparatus 10 through the inner pipe 35 is filtered to a certain degree, 21).

In an embodiment of the present invention, the inner pipe 35 is provided with the water filter 35a. However, as another embodiment of the present invention, the inner pipe 35 may be provided with a filtering network.

Accordingly, it is possible to reduce the degree of contamination of the filter material 21 with the foreign matter mixed with the raw water to some extent.

Although not shown in FIG. 1 and FIG. 2, the fourth valve 36d is connected to a purified water supply pipe disposed outside the main body 20 and discharging purified water, and the multi-filtration apparatus 10 ) May include a filter material sterilizing part provided in the purified water supply pipe. This filter material sterilizing part may be made of an ultraviolet sterilizing lamp.

Accordingly, the filter material 21 is subjected to the ultraviolet sterilization treatment by the filter material sterilizing section, so that the purified water filtered through the multi-filtration apparatus 10 can be supplied in a cleaner state.

1, a multi-filtration apparatus 10 according to the present invention includes a raw water supply unit 30 connected to a main body 20, a first valve 36a, a second valve 36b, An air compressor 40 is provided which provides pressure to open and close the three-way valve 36c, the fourth valve 36d and the fifth valve 36e, respectively.

An air hose 41 is connected to the air compressor 40 so as to supply air and a ball valve 42 for controlling supply of air is provided at the tip of the air hose 41.

In addition, the multi-filtration apparatus 10 is provided with a steam generator 50 for cleaning the filter medium 21. The steam generator 50 injects steam at a high temperature during backwashing, thereby removing low-concentration organic substances, hobby components, and volatile substances in the filter medium 21.

A steam hose 51 is connected to the steam generator 50 to supply steam to the main body 20 and a ball valve 52 is installed at an end of the steam hose 51.

The ball valve 52 of the air compressor 40 and the ball valve 52 of the steam generator 50 are connected to a nozzle cleaning unit 55 provided inside the filter member 21.

The air supplied from the air compressor 40 is sprayed to the nozzle cleaning unit 55, and the steam supplied from the steam generator 50 is sprayed.

The steam generator 50 supplies steam at a temperature of 80 to 100 ° C. When the filter material 21 is backwashed, steam is supplied to the nozzle cleaning unit 55 to heat the filter material 21. At the same time, air is supplied from the air compressor 40 to clean the filter medium 21 with the fine particulate.

This filter material 21 is clogged by impurities or slim and the surface of the filter material 21 is cleaned by the air supplied from the air compressor 40 and the steam supplied from the steam generator 50 And backwashing is performed by microbubbles while the filter material 21 is heated to a high temperature.

The steam supplied from the steam generator 50 removes the low concentration organic substances, the hobby components and the volatile substances in the filter material 21, thereby increasing the filtration efficiency of the filter material 21.

An exhaust pipe 43 is vertically installed in the main body 20 so that the air inside the main body 20 can be discharged to the outside through the upper portion of the main body 20. [

In addition, the multi-filtration unit 10 is provided with a collecting unit 45 for collecting backwash water after backwashing. A control unit 60 for controlling the multi-filtration apparatus 10 based on the result detected by the sensing unit 37, and a controller 60 for controlling the multi-filtration apparatus 10 based on the result detected by the sensing unit 37. [ ).

The control unit 60 determines that the water level of the raw water stored in the water tank of the raw water supply unit 30 is higher than a predetermined high level in the sensing unit 37, The controller controls the pump 31 to operate and controls the air compressor 40 so that the first valve 36a and the fourth valve 36d are opened and the remaining valves are closed to perform the filtering function.

If the control unit 60 detects that the water level of the raw water stored in the water tank of the raw water supply unit 30 is lower than a predetermined low level, the control unit 60 stops the filtration process, 3 valve 36c is opened and the remaining valves are closed so that the backwash function is performed and at the same time air bubbles are introduced into the main body 20 through the nozzle cleaning part 55 The air compressor 40 can be controlled so as to be supplied to the filter medium 21 of the compressor.

That is, the air compressor 40 according to the present invention includes a first valve 36a, a second valve 36b, a third valve 36c, a fourth valve 36d, which are electrically operated valves under the control of the controller 60, And the fifth valve 36e are selectively opened and closed by supplying air to the nozzles (not shown) of the nozzle cleaning unit 55 during backwashing so that the washing water sprayed from the nozzles is sprayed together with the air bubbles, 21 is further improved.

After the backwash by the air compressor 40 is completed, high temperature steam of 80 to 100 ° C. is supplied from the steam generator 50, and the high-temperature steam is sprayed to the filter material 21 to clean the filter material 21 .

The backwash by the air compressor 40 is performed and the washing with the steam generator 50 is repeatedly performed. Backwashing and cleaning of the filter material 21 are repeated periodically.

2 to 4, the nozzle cleaning portion 55 of the multi-filtration apparatus 10 according to the present invention is arranged spirally from the upper portion to the lower portion of the laminated filter medium 21, 55 are provided with a plurality of nozzles at regular intervals and the nozzles are installed outward from the center of the main body 20. [

The nozzles of the nozzle cleaning unit 55 can uniformly spray the high-pressure cleaning water to the filter member 21 so that the foreign matter adhering to the surface of the filter member 21 is effectively separated from the filter member 21, 10 can be maintained in an optimum state and at the same time, the filter material 21 can be used semi-permanently without having to be replaced.

Although not shown, a washing water supply unit (not shown) is connected to the nozzle washing unit 55 so that the washing water can be supplied by the supply pump.

3, the nozzle cleaning portion 55 is provided in an annular ring shape corresponding to the inner circumferential surface shape of the main body 20, and the nozzle cleaning portion 55, as shown in FIGS. 3 and 4, Are arranged in a direction in which the filter media (21) are laminated or inclined in a spiral direction in which the filter media (21) are laminated.

Accordingly, the washing water can be uniformly sprayed vertically, horizontally, and horizontally through the nozzle by the filter material 21 stacked in the main body 20.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

10: Multi-filtration device 20:
21: filter medium 22: strainer
30: raw water supply part 31: pump
32: overflow pipe 33: upper pipe
34: lower pipe 35: inner pipe
35a: Water filters 36a to 36e: first to fifth valves
37: sensing part 40: air compressor
41: air hose 42: ball valve
43: exhaust pipe 45:
50: steam generator 51: steam hose
52: ball valve 55: nozzle cleaning unit
60:

Claims (4)

A multi-filtration apparatus for purifying raw water by a filter material composed of a plurality of activated carbon layers by gravel, sand, activated carbon, and carbon,
A body in which the filter medium is laminated in a plurality of layers;
A raw water supply unit for supplying raw water to be filtered to the laminated filter medium inside the main body;
An air compressor for controlling the plurality of valves so that supply and shut-off of raw water to the filter medium, supply of steam and shut-off of the steam are performed;
And a steam generator for spraying high-temperature steam to the filter medium when the filter medium inside the main body is clogged due to impurities or slimness, thereby heating the filter medium to a high temperature and then supplying steam to clean the filter medium by fine bubbles ,
Wherein the washing is periodically performed to remove foreign matters remaining in the filter material by filtration of raw water supplied by the raw water supply unit and high temperature steam supplied from the steam generator,
An air hose is connected between the main body and the air compressor so that air is supplied from the air compressor,
A steam hose is connected between the main body and the steam generator so that steam is supplied from the steam generator,
Wherein the air hose and the steam hose are provided with a ball valve for opening and closing air supplied from the air compressor and a ball valve for opening and closing steam supplied from the steam generator,
Wherein the air hose and the steam hose are joined by a nozzle cleaning unit to selectively inject air or steam into the filter medium inside the main body,
Wherein the nozzle cleaning unit is spirally installed to supply air or steam to the filter media stacked in the main body,
Wherein the nozzle cleaning unit has a plurality of holes formed at regular intervals so that air or steam is injected at a high pressure. delete delete The method according to claim 1,
An external pipe connected to the raw water supply unit such that raw water to be filtered is supplied to the main body;
And a plurality of valves installed to selectively open and close the raw water supplied through the external pipe.
KR1020150103613A 2015-07-22 2015-07-22 Multi Filtration Equipment KR101627707B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200000621U (en) * 2018-09-11 2020-03-19 방현식 Bubble generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06182117A (en) * 1992-12-17 1994-07-05 Jingo Nakazawa Backwashing of filter material
KR200328056Y1 (en) * 2003-06-30 2003-09-26 조부연 Plural point nozzle soften hard water implements
KR100560812B1 (en) * 2001-12-10 2006-03-14 주식회사 포스코 Filtering system with self-cleaning function
KR101216133B1 (en) 2012-06-01 2012-12-28 선일환경(주) Filtration apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06182117A (en) * 1992-12-17 1994-07-05 Jingo Nakazawa Backwashing of filter material
KR100560812B1 (en) * 2001-12-10 2006-03-14 주식회사 포스코 Filtering system with self-cleaning function
KR200328056Y1 (en) * 2003-06-30 2003-09-26 조부연 Plural point nozzle soften hard water implements
KR101216133B1 (en) 2012-06-01 2012-12-28 선일환경(주) Filtration apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200000621U (en) * 2018-09-11 2020-03-19 방현식 Bubble generator
KR200492079Y1 (en) * 2018-09-11 2020-08-03 방현식 Bubble generator

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