Small Green Aquarium Sponge Filter Only for 5-20 Gallon Tank

This sale is for a sponge filter only and does not include air pump, airline tubing, or check valve. Sponge filters function as both a biological/mechanical filter and a bubbler (aerator) in one. It operates by using an external air pump to push air through the submerged sponge, which creates a vacuum that pulls water through the sponge, trapping debris, and creating surface agitation for oxygenation. This filter comes with a 25ppi coarse anti-clogging sponge, which completely eliminates the nee...