Sunsun Aquarium Canister Filter Replacement Sponge for HW-304 AB / 404 AB | 2pc pack

Sunsun Aquarium Canister Filter Replacement Sponge for HW-304 AB / 404 AB. Has a good filtering function to make water clearer. Supports to reduce the growth of bacteria’s In good quality with open pore and large surface area to promote bacteria break down. Safe for fresh and Marine water. This spare sponge will fit for Sun Sun  HW-304A, 304B and HW-404A, 404B external canister filter.