We found that only fluidized sand bed filters out perform quality sponge filters for aerobic bio filtration. The truly best sponge filters (such as the USA made Patented AAP Hydro Sponge Filters) can be used to compliment another filter, such as a power "hang on back" (HOB) or canister filter, or even as a standalone filter, as per our extensive controlled tests. This has led to many otherwise knowledgeable aquarium keepers to point out that a negative is that sponge filters lose their load of trapped particulates upon removal when in fact this is rarely true when the proper quality USA made sponge is mated to the aquarium to the aquarium it will filter. Unfortunately a large number of lower quality Chinese made sponge filters (many violating USA patents for design too) have flooded the market in part due to snake oil salespersons on YouTube and elsewhere often promoting only the coarse sponge over the fine sponge when in fact professional experience over the decades shows that in 2/3s of aquarium the fine is the better choice or better a combination of the two. (The picture above is a Hydro Sponge #1 in a 6 x 6 x 6 Betta tank.) It is also noteworthy that the concept is not new, dating back at least to the early 1960s with the Lustar or Hamburger Mattenfilter Sponges. I have professional used these filters for my aquarium maintenance business for 40 plus years with excellent results in freshwater, saltwater and ponds. Many aquarists look past these filters because of their simplicity, but therein lies their quality.
Sponge filtration is an often-overlooked type of filtration for both large and small freshwater tanks and bowls, and even ponds or marine aquariums.
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