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Biological filtration is essential for the health of Koi, Goldfish, and other fish and there is no better biological filtration than a high-quality durable sponge filter. The Hydro-Pond filter utilizes specially constructed reticulated filter foam that is heavy duty enough to withstand the high flow rates needed to circulate water in a pond, while also providing large and dense medium for nitrogenous bacteria to colonize. In addition, the foam also traps particulates providing excellent mechanical filtration.