![]() The water in this optimized design is spread out by a pinkie pad in a holed tray. The design is much better than a 100% bioball design. Unfortunately most designs of wet dry sumps then just put the water through submerged bioballs. This is The water dribbles through the bioballs becoming well aerated. The holes in the tray drip the water onto a height of bioballs which is one third to one half the remaining height. The tray sits at least one inch deep in the sump so if it overflows it won’t go on the floor. This matting is in a tray which has holes in the bottom of it. In a typical wet-dry filter the initial media met by the incoming gravity fed water flow from the aquarium is a mechanical filter such as the “pinky” polyester floss matting material. Hemichromis bimaculatus Red Jewel Cichlid Wet Dry Filters in Depth For the optimum convert it to a K1 fluidized bed. Change the media out to pot scrubbers, 20 ppi foam or submerged K1 media. The best thing to do with any wet dry filter is to simply convert it to a completely submerged filter. And wet dry sumps can be exceedingly difficult to get a good “trickle”, with no channeling or overflow. A 100% bioballs wet dry sump will have only about 10% of the efficiency of a fluidized bed K1 sump. This gives better biofiltration than a trickle filter but is still only about 70% as efficient as a static media submerged bioballs filter. Wet-dry filters are a hybridized version of the trickle sump filter where some submerged static biomedia is added. ![]()
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