Round Pre-Filter Sponge W/Center Hole

• Use in hang on overflows/prefilters
• 6" long with a 1" center hole

South Ocean Five Round Prefilter Sponge
This round pre-filter sponge (which is used in overflow boxes) is 6x2-3/4 with a 1 inch center hole. This open cell sponge will give you a better water flow, while consistently collecting the particles from the aquarium. Buys spares so you can rotate them out every few days for cleaning.