Six 2.5 watt wavemakers will cost about $40 (less than a large air pump and several high quality air stones). If noise is a concern use wavemakers to do the fluidized bed movement. And large air pumps can be noisy in their own right. This amount of bubbles can be noisy, VERY noisy. Fluidized beds need a whole lot of aeration and bubble to be effective. One little discussed area in filtration is the noise level. Neocaridina davidi Shrimp Replacing the Air Stones with Wavemakers It maximizes the protection against the pump running dry because of evaporation. The design maximizes both the volume of water in the sump and the media volume in the sump. As a K1 fluidized bed, research has shown it is simply the most efficient filter there is. This design is the best design for an aquarium filter you can have. The best design for a fluidized bed sump is: aquarium fluidized bed design filter biomedia efficiency Design of a Fluidized Sump If one looks at the top line below one will see that fluidized K1 is 540/340 or 59% better than stationary 30 ppi foam and 540/30 or 1800% better than ceramic balls. Many millions of dollars of research in the area of aquaculture have established that fluidized K1 beds are the best type of filter by a factor of 59% to 1800% on a cubic inch per cubic inch of filter basis. Note the very important circular movement of the K1 media in the sump. This motion is well illustrated by this sump: Operation of Fluidized bed These sump filters use a polyethylene high surface area media (K1 micro, K1, Hel-X, etc.) in a fluidized moving bed set-up.
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