JP4116888B2 - Internal filtration device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal filtration device that includes a filtration case installed in a breeding aquarium for goldfish, tropical fish, seawater fish, etc., and circulates and filters the water in the aquarium with an underwater pump.
[0002]
[Prior art]
Conventionally, in order to breed and cultivate ornamental fish such as goldfish, tropical fish and saltwater fish in an aquarium, a filtration case has been installed in the aquarium as a filtration device for filtering and purifying the water in the aquarium. A filter medium is accommodated in the filter chamber formed in the filter chamber, an upstream chamber communicating with the water suction port is formed outside the filter medium, and a downstream chamber communicating with the discharge port is formed inside the filter medium, and a water tank is formed in the downstream chamber. An internal filtration device is known in which air from an air pump provided outside is filtered by passing the filter medium from the upstream chamber through the filter medium and then returned to the water tank through the downstream chamber. (e.g., see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-9-38637.
[0004]
[Problems to be solved by the invention]
By the way, in such an internal filtration apparatus, since the ejection pipe which opened the ejection port for ejecting the water filtered with air on the upper surface of the filtration case in a water tank protrudes upwards, this The fish in the aquarium may come into contact with the spout pipe, particularly the edge of the spout, and the fish body may be damaged, and the spout protrudes upward from the center of the filtration case. There are problems such as damaging the scenery, and further, there is a problem that the packaging box for packing the filtration device becomes large and the transportation cost increases.
[0005]
This invention is made | formed in view of this situation, and it aims at providing the novel internal type | formula filtration apparatus which solved the said problem and improved the purification function of water further. is there.
[0006]
[Means for Solving the Problems]
In order to achieve the object, the invention described in claim 1 includes a case main body and a bottom case detachably stacked on a lower surface thereof, and an upper filtration chamber in the case main body is provided as an upstream chamber in the case main body. , Containing a dense filter medium partitioned into a downstream chamber, the upstream chamber communicating with a first water inlet opening in the case body, a submersible pump being accommodated in the downstream chamber, the lower filter chamber, accommodating the pebbles which serves as a crude filter medium Kaneshige weight, the passing Mizuguchi in its upper wall communicating with the downstream chamber, also in its bottom wall and opening the second water inlet respectively, the The first flow of water that has passed through the dense filter medium and the second flow of water that has passed through the pebbles are merged and sucked into the downstream chamber, and discharged from the discharge port. In the internal filtration device, the upper surface of the case body The water supply pipe is detachably connected to the discharge port of the submersible pump, and the water supply pipe is freely rotatable with respect to the case body and can be vertically expanded and contracted. According to this feature, there is no projection of a conventional water jet pipe on the upper surface of the case body. The tube not only damages the ornamental fish, but also improves the appearance of the entire filtration case, and further reduces the volume of the packaging box that houses the filtration case, thereby reducing its transportation cost. Can do. Further, the water pipe can increase the degree of freedom of arrangement with respect to the filtration case, and the layout of the entire filtration device with respect to the water tank is facilitated.
[0007]
In order to achieve the above object, the invention according to claim 2 includes a case main body, a first bottom case and at least a second bottom case, which are stacked on the lower surface of the case main body and are detachably coupled. The case body contains a dense filter medium that divides the upper filtration chamber in the interior into an upstream chamber and a downstream chamber, and the upstream chamber communicates with a first water inlet opening in the case body, A submersible pump is accommodated in the downstream chamber, while a pebble functioning as a coarse filter medium and weight is accommodated in the lower filtration chamber of the first bottom case, and a water passage opening communicating with the downstream chamber is provided on the upper wall thereof. In addition, a second water inlet is opened on the bottom wall, and the first flow of water that has passed through the dense filter medium by the operation of the submersible pump and the second flow of water that has passed through the pebbles. Are combined with the downstream chamber and sucked and discharged from the discharge port. Unishi, also wherein the first 2 of the bottom case houses the purification element of water, the water in the second flow, the outer passing pebbles a coarse filter media, also the purification element of the water and characterized in that so as to be sucked into the downstream chamber by the water pump through, according to this aspect, it is possible to further improve the purifying function of the water in the water tank, in particular breeding ornamental fish and water plants to develop Depending on the type, it is easy to make water with the optimum water quality.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0009]
A first embodiment of the present invention will be described with reference to FIGS.
[0010]
FIG. 1 is a perspective view when an internal filtration device is set in a water tank, FIG. 2 is an overall side view of a partial longitudinal section of the filtration device (along line 2-2 in FIG. 3), and FIG. 4 is a cross-sectional view taken along line 3-3, FIG. 4 is a view taken in the direction of the arrow 4 in FIG. 2, and FIG. 5 is an exploded perspective view of the filtration device.
[0011]
The filtration case c provided in the water tank V is composed of a synthetic resin case main body 1 and a synthetic resin bottom case 2 that is detachably connected to the lower surface of the case main body 1.
[0012]
The case body 1 is formed of a transparent or translucent hard synthetic resin material to form a planar octagonal cylinder shape, and the lower surface thereof is open over the entire surface. As shown in FIGS. 1 and 5, the upper surface of the upper wall of the case main body 1 is formed as a flat surface, and a circular inlet / outlet 4 for taking in and out a submersible pump P described later is opened at the center thereof. In addition, a large number of first water inlets, that is, upper water inlets 5 are formed around the periphery. In addition, a pair of insertion tongue pieces 6 are formed on the lower edge of the opposing portion of the case body 1.
[0013]
On the other hand, the bottom case 2 is made of the same material as the case main body 1 and has the same planar shape as that of the case main body 1, and a cover plate 2B is detachably fitted to the upper surface of the bottom case main body 2A formed flat in the vertical direction. The bottom case 2 is loaded with pebbles 7 such as large corals, and the pebbles 7 function as a coarse filter medium and weight of the filtration device, as will be described later.
[0014]
As clearly shown in FIG. 4, the bottom surface of the bottom case 2 has a large number of second water inlets, that is, the lower water inlets 9 over the entire surface thereof, and the upper surface of the bottom case 2, that is, the cover plate 2B, A large number of water passages 10 are formed, and the inside of the bottom case 2 communicates with the case body 1 through the water passages 10. Also, a pair of insertion holes 11 are formed integrally on the opposite side surface of the bottom case body 2B of the bottom case 2, and the insertion tongue piece 6 is inserted into and engaged with these insertion holes 11. 1 and 2, the case body 1 is detachably assembled on the bottom case 2 to form the filtration case.
[0015]
The case main body 1 and the bottom case 2 form an upper filtration chamber Fu, and the filtration holding frame 14 is accommodated in the upper filtration chamber Fu. This filtration holding frame 14 is configured by integrally connecting a top plate 16 having a drain opening 15 at the center and an outer peripheral edge formed in a wave shape, and an octagonal bottom plate 17 by a plurality of connecting rods 18. A communication port 19 is opened at the center of the bottom plate 17 and a large number of small holes 20 are formed around the communication port 19. The communication port 19 and the plurality of small holes 20 are formed in the water flow port 10. Communicated. A plurality of upper locking projections 24 extending downward at equal intervals in the circumferential direction are integrally provided on the lower surface of the top plate 16, and the upper locking projections 24 are also formed on the upper surface of the bottom plate 17. The lower latching protrusions 23 corresponding to are protruded integrally with the circumferential direction at equal intervals.
[0016]
A dense filter medium 26 formed in a plate shape is held in the filter medium holding frame 14 in a replaceable manner. As shown in FIGS. 3 to 5, the plate-like dense filter medium 26 is zigzag alternately with the inner peripheral surface thereof to the connecting rod 18 and the outer peripheral surface thereof to the upper and lower locking projections 24 and 23. By being locked in the shape, it is bent into a corrugated shape, and both end edges thereof are brought into contact with each other, thereby forming a cylindrical shape and being held by the filter medium holding frame 14.
[0017]
Insertion holes 27 are respectively opened in the corners of the cover plate 2B of the octagonal bottom case 2, and the lower ends of the plurality of connecting rods 18 of the filter medium holding frame 14 can be freely inserted into these insertion holes 27. By inserting, the filter medium holding frame 14 can be held at a predetermined position on the bottom case 2.
[0018]
After holding the filter medium holding frame 14 assembled with the filter medium 26 at a predetermined position on the bottom case 2, the case body 1 is put on the filter medium holding frame 14 from the bottom of the opening, and the insertion tongue piece 6 is inserted. If the insertion hole 11 is inserted and locked, the filtration case c in which the filter medium holding frame 14 is accommodated can be assembled, the upper filtration chamber Fu in the case body 1 and the lower filtration chamber in the bottom case 2. Fd is formed. The upper filtration chamber Fu is partitioned by the filter medium 29 into an outer upstream chamber, that is, an unpurified chamber 29, and an inner downstream chamber, that is, a purifying chamber 30, and the upstream chamber 29 passes through the first water inlet 5. The downstream chamber 30 communicates with the outside, and communicates with a water absorption side of a submersible pump P, which will be described later, and communicates with the lower filtration chamber Fd through the small hole 20.
[0019]
In the filtration case c, the submersible pump P is inserted into the downstream chamber 29 surrounded by the dense filter medium 26 through the inlet / outlet 4 opened on the upper surface of the case body 1.
[0020]
As clearly shown in FIGS. 2 and 5, the submersible pump P is formed in a cylindrical shape, the suction port 32 (FIG. 2) is opened on the lower surface, and the discharge port 33 is opened on the upper surface. A cap-shaped strainer 35 having a large number of slits 34 is fitted on the outer peripheral surface of the lower end so as to surround the suction port 32. In a state where the submersible pump P is set in the filtration case c, the upper surface of the submersible pump P is substantially flush with the upper surface of the case body 1 and is flat so that there is no step between them. . A lead wire 36 connected to the motor of the submersible pump P is extended from the upper surface of the submersible pump P. Note that the submersible pump P is put into and out of the filtration case c by gripping the lead wire 36.
[0021]
As shown in FIG. 2, a discharge pipe 33 of the submersible pump P is detachably connected with a water supply pipe 40 for refluxing clean water after filtration into the water tank V. The water supply pipe 40 is connected to the first elbow 41, the substantially horizontal communication pipe 42, the second elbow 43, and the substantially vertical telescopic pipe, which are sequentially connected from the downstream side to the upstream side so as to be detachable and rotatable. 44, a third elbow 45 and a substantially horizontal shower pipe 46, and the outer end of the shower pipe 46 is closed. In the telescopic tube 44, an outer tube 44O and an inner tube 44I are fitted so as to be telescopic, and the shower tube 46 is provided with a plurality of nozzle holes 47 that are opened downward at intervals in the longitudinal direction. . The third elbow 45 is fitted with an arc-shaped flow rate adjusting valve 48 that can continuously adjust the flow rate of water flowing through the flow passage from the upper surface thereof.
[0022]
According to the operation of the submersible pump P, the water discharged from the discharge port 33 is supplied to the water supply pipe 40 and can be discharged into the water tank V from the plurality of injection ports 47 of the shower 46. The fountain flow rate can be adjusted by controlling the rotation of the flow rate adjusting valve 48. Moreover, since the water supply pipe 40 can freely set the relative position with respect to the filtration case c by rotating around the discharge port 33 of the submersible pump P, the water supply pipe 40 is biased toward the inner wall surface of the water tank V. It can be placed so that it doesn't get in the way, and it can look good. Further, the vertical position of the shower tube 46 can be adjusted by adjusting the expansion and contraction of the expansion tube 44.
[0023]
Next, the operation of the first embodiment will be described.
[0024]
As shown in FIG. 1, the filtration case c in which the submersible pump P is set is installed on a pebble (large coral) laid in the water tank V. If the submersible pump P is driven here, the water in the water tank V is divided into two systems and sucked into the filtration case and filtered. That is, a part of the water in the water tank V is sucked into the unpurified chamber, that is, the upstream chamber 29 from the first water inlet, that is, the upper water inlet 5, of the case body 1 as shown by the arrow A in FIG. After being filtered, the water enters the clean chamber, that is, the downstream chamber 30, and is sucked into the submersible pump P. Further, as shown in FIG. 2 arrow B, another part of the water in the water tank V is filtered through pebbles (large coral) constituting a coarse filter medium in the bottom case 2, and then the small holes 20. And enters the downstream chamber 30 and is sucked into the submersible pump P from there. The clean water discharged from the submersible pump P is sent from the discharge port 33 to the water supply pipe 40, and is ejected into the water tank V from the injection port 47 of the shower pipe 46 of the water supply pipe 40. Thus, the water in the water tank V can be purified by reflux.
[0025]
Thus, as described above, in the process of recirculating and purifying the water in the water tank V by driving the submersible pump P, the water in the water tank V is divided into two systems and flows in the same manner as described in Patent Document 1. One of the streams flows through the dense filter medium 26 having a relatively large flow resistance, and the flow velocity thereof becomes relatively slow, thereby promoting the growth of aerobic microorganisms in the dense filter medium 26 (generally, the flow velocity of water flowing through the filter medium is increased). If it is fast, it is difficult for aerobic microorganisms to propagate there), and the aerobic microorganisms decompose organic substances such as residual food and feces that adhere to and accumulate on the dense filter medium 26, thereby reducing clogging and reducing the clogging. Aerobic microorganisms can be used as live food for ornamental fish. On the other hand, the flow of the other water passes through the pebbles (large coral) 7 constituting the coarse filter medium with little resistance, and then reaches the downstream chamber 30.
[0026]
In the downstream chamber 30, as described above, the water of one flow (arrow A) and the water (arrow B) of the other flow merge and are sucked into the submersible pump P. The clean water discharged from the submersible pump P is pumped to the water supply pipe 40 as shown by an arrow C, and becomes shower-like from the plurality of outlets 47 of the shower pipe 46 of the water supply pipe 40 in the water tank V. To reflux. The flow rate of clean water ejected from the shower tube 46 is adjusted by rotation control of the flow rate adjusting valve 48. Further, the water supply pipe 40 can be arranged at a position in the water tank V that does not get in the way by rotating and adjusting around the discharge port 33 of the water pump P.
[0027]
By the way, the upper surface of the filtration case c is formed flat, and the conventional water ejection pipe does not protrude from the upper surface, and water is not directly ejected therefrom. By the case c, there is no concern that the ornamental fish will be damaged or that the small fish will enter the water discharge pipe 33.
[0028]
Next, a second embodiment of the present invention will be described with reference to FIG. 6. FIG. 6 is a longitudinal sectional side view of the main part of the filtration device, and the same elements as those in the first embodiment are the same in the drawing. A sign is attached.
[0029]
In the second embodiment, the bottom case 2 constituting the filtration case c is composed of a plurality of first, second and third bottom cases 2 (1), 2 (2) and 2 (3). These first, second and third bottom case 2 (1), 2 (2), 2 (3) is sequentially detachably coupled with vertically stacked, their inside, respectively heterologous Of water purification elements are loaded. The uppermost part, that is, the first bottom case 2 (1) connected to the lower surface of the case body 1 corresponds to the bottom case 2 of the first embodiment, and is formed in substantially the same structure as the first case. That is, a cover plate 2B is detachably fitted on the upper surface of the opening of the bottom case body 2A. The bottom case 2 is loaded with pebbles 7 such as large ridges. The first bottom case 2 At least a pair of insertion holes 50 is formed on the outer periphery of the bottom surface of (1) (this point is different from the bottom case 2 of the first embodiment). The second bottom case 2 (2) is also formed substantially the same as the first bottom case 2 (1), and the second bottom case 2 (2) has at least one pair on the outer periphery of its upper surface. The hook-like insertion tongue piece 51 has at least a pair of insertion holes 50 formed on the outer periphery of the lower surface thereof, and this point is structurally different from the first bottom case 2 (1). And in this 2nd bottom case 2 (2), coral sand for PH adjustment is loaded, for example. Further, the third bottom case 2 (3) is formed in the same manner as the second bottom case 2 (2), that is, at least a pair of hook-like insertion tongues 51 are provided on the outer periphery of the upper surface. At least a pair of insertion holes 50 are formed on the outer periphery of the lower surface. And in this 3rd bottom case 2 (3), the activated carbon 54 which performs actions, such as a clear water of water, deodorizing, decoloring, is loaded, for example.
[0030]
As shown in FIG. 6, if the first bottom case 2 (1) is laminated on the lower surface of the case body 1 and the insertion hole 50 is engaged with the insertion tongue piece 6 of the case body 1, The first bottom case 2 is detachably coupled to the lower surface of the case body 1. Further, the second bottom case 2 (2) is laminated on the lower surface of the first bottom case 2 (1), and the insertion tongue piece 51 is engaged with the insertion hole 50 of the first bottom case 2 (1). When combined, the second bottom case 2 is detachably fixed to the lower surface of the first bottom case 2. Similarly, the third bottom case 2 (3) is laminated on the lower surface of the second bottom case 2 (2), and the insertion tongue piece 51 is inserted into the insertion hole 50 of the second bottom case 2 (2). The third bottom case 2 (3) is detachably coupled to the lower surface of the second bottom case 2 (2).
[0031]
As described above, the first, second, and third bottom cases 2 (1), 2 (2), and 2 (3) are sequentially stacked and bonded to the lower surface of the case body 1.
[0032]
Next, the operation of the second embodiment will be described.
[0033]
When the submersible pump P is driven, the water in the water tank V is divided into two systems as in the first embodiment, and is sucked into the filtration case c and filtered. That is, a part of the water in the water tank V is sucked into the unpurified chamber, that is, the upstream chamber 29 from the first water inlet, that is, the upper water inlet 5, of the case body 1 as shown by the arrow A 'in FIG. After passing through 26 and being filtered, it enters the clean chamber, that is, the downstream chamber 30 and is sucked into the submersible pump P. Further, as shown in the arrow B 'in FIG. 6, the other part of the water in the water tank V is sequentially supplied to the third, second and first bottom cases 2 (3), 2 (2) and 2 (1). It passes through the small hole 20 and enters the downstream chamber 30, from which it is sucked into the submersible pump P and pumped to the water supply pipe 40 as shown by the arrow C ′ in FIG. 6.
[0034]
By the way, the water that has flowed into the third bottom case 2 (3) is subjected to clear water, deodorization, decolorization, etc. by the activated carbon 54 inside, and then the water that has flowed into the second bottom case 2 (2). The PH is adjusted by the coral sand 53 inside thereof, and the water flowing into the first bottom case 2 (1) is filtered by the pebbles (large coral) 7 constituting the coarse filter medium inside. Is done.
[0035]
The purified water of the first and second flows that merged in the downstream chamber 30 is sent from the discharge port 33 to the water supply pipe 40 as in the first embodiment, and the water supply pipe 40. From the nozzle 47 of the shower pipe 46, the water in the water tank V is ejected into the water tank V, whereby the water in the water tank V can be refluxed and purified.
[0036]
Thus, as described above, in the process of recirculating and purifying the water in the water tank V by driving the submersible pump P, the water in the water tank V is divided into two systems, and one of the flows has a flow resistance. A relatively large dense filter medium 26 flows and its flow rate becomes relatively slow, thereby promoting the growth of aerobic microorganisms in the dense filter medium 26 (generally, when the flow rate of water flowing through the filter medium is high, aerobic microorganisms are present there. The aerobic microorganisms are difficult to reproduce), and the organic matter such as residual food and feces that adhere to and accumulate on the dense filter medium 26 is decomposed to reduce clogging, and the aerobic microorganisms are used as live food for ornamental fish. Can do. On the other hand, the other water flow passes through the activated carbon 54, the coral sand 53 and the pebbles (large coral) 7 constituting the coarse filter medium with little resistance and is purified and filtered as described above, and then reaches the downstream chamber 30.
[0037]
In the second embodiment, the number of the plurality of bottom cases 2 stacked on the lower surface of the case body 1 may be two, or four or more. Elements (excluding coarse filter media and pebbles that function as weights) can be freely selected as necessary. For example, in addition to the purification elements, barley stones, moss generation inhibitors, etc. Be contained.
[0038]
Thus, in this second embodiment, the second water flow can pass through other water purification elements in addition to the pebbles 7 constituting the coarse filter medium. Suitable water purification becomes possible. In addition, by changing the purification elements of different kinds of water respectively accommodated in the plurality of bottom cases, it is possible to make water with the optimum water quality for breeding and breeding ornamental fish.
[0039]
As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.
[0040]
For example, in the second embodiment, the bottom case containing the pebbles constituting the coarse filter medium and weight is an intermediate portion of a plurality of bottom cases stacked instead of being arranged directly below the case body 1, that is, at the top. It may be arranged at the bottom.
[0041]
【The invention's effect】
As described above, according to the first aspect of the present invention, in the internal filtration apparatus, the conventional water jet pipe does not protrude from the upper surface of the case body, so that the ornamental fish is provided by the jet pipe. As a result, the appearance of the entire filtration case can be improved, and the volume of the packaging box that accommodates the filtration case can be reduced, and the transportation cost can be reduced. Furthermore, the water pipe can be easily laid out with respect to the water tank of the entire filtration device, which can increase the degree of freedom of arrangement with respect to the filtration case.
[0042]
According to the invention described in claim 2, in the internal filtration device, the function of purifying water in the aquarium can be further enhanced, and it is particularly suitable for them depending on the type of ornamental fish or aquatic plants to be bred and cultivated. Water quality can be made easily.
[Brief description of the drawings]
FIG. 1 is a perspective view when an internal filter is set in a water tank (first embodiment).
FIG. 2 is an overall side view of a partial longitudinal section (along line 2-2 in FIG. 3) of the filtration device (first embodiment).
3 is a sectional view taken along line 3-3 in FIG. 2 (first embodiment).
4 is a view taken along line 4 in FIG. 2 (first embodiment).
FIG. 5 is an exploded perspective view of the filtration device (first embodiment).
FIG. 6 is a longitudinal sectional view of a main part of a filtration device (second embodiment).
[Explanation of symbols]
1. Case body 2 ... Bottom case 2 (1) ... First bottom case 2 ( 2) ... 2nd bottom case 2 (3) ... 3rd bottom case 5 ... 1st Water inlet (first water inlet)
7 ····· Pebbles (coarse filter material)
9 ············· 2nd water inlet (second water inlet)
10 ·············· 26 ·········································································· ... downstream chamber 33 ... discharge port 40 ... water pipe 46 ... shower pipe 53・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Water purification element (coral sand)
47 ······················································································································ Upper filtration chamber Fd ······underwater pump

Claims (2)

A case main body (1) and a bottom case (2) detachably stacked on the lower surface thereof are provided. In the case main body (1), an upper filtration chamber (Fu) therein is provided as an upstream chamber (29). And a dense filter medium (26) partitioned into a downstream chamber (30), and the inside of the upstream chamber (29) communicates with a first water inlet (5) opened in the case body (1). In the downstream chamber (30), a submersible pump (P) is accommodated, while in the lower filtration chamber (Fd) of the bottom case (2), a pebble (7) functioning as a coarse filter medium and weight is accommodated. A water inlet ( 10) communicating with the downstream chamber (30) is opened on the upper wall, and a second water inlet (9) is opened on the bottom wall of the submersible pump (P). The first stream of water that has passed through the dense filter medium (26) and the second stream of water that has passed through the pebbles (7) are used as the downstream. It is combined (30) sucked and so as to discharge from the discharge port (33), inside type filtration apparatus,
The upper surface of the case body (1) is formed flat, and a water pipe (40) is detachably connected to the discharge port (33) of the submersible pump (P). The water pipe (40) An interior characterized by having a shower tube (46) that is freely rotatable with respect to the main body (1) and that can be vertically expanded and contracted and that has a number of nozzle holes (47) opened at the top thereof. Type filtration device. A case body (1), and a first bottom case (2 (1)) and at least a second bottom case (2 (2)), which are stacked on the lower surface of the case main body and are detachably coupled,
The case body (1) contains a dense filter medium (26) that divides the upper filtration chamber (Fu) therein into an upstream chamber (29) and a downstream chamber (30). 29) communicates with the first water inlet (5) opened in the case body (1), and accommodates a submersible pump (P) in the downstream chamber (30), while the first bottom In the lower filtration chamber (Fd) of the case (2 (1)), a pebble (7) that functions as a coarse filter medium and a weight is accommodated, and a water passage ( 10) and a second water inlet (9) on the bottom wall thereof, and the first flow of water that has passed through the dense filter medium (26) by the operation of the submersible pump (P), The second stream of water that has passed through the pebbles (7) joins the downstream chamber (30) and is sucked and discharged from its discharge port (33). And so, also, the second bottom case (2 (2)) In the houses the purification element of water (53), water in the second flow, a rough filter medium pebbles (7) The internal filtration device is characterized in that it passes through the water purification element (53) and is sucked into the downstream chamber (30) by the submersible pump (P) .

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