Hydro-Pond III Sponge Filter for Aquariums and Outdoor and Indoor Ponds up to 750 Gallons

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.