Aqua One 402s Black Sponge Pads – For Advance 550/750 Canister Filters – 2 pack

A new 402s twin pack of black fine Aqua One Sponge for the Aqua One Advance 550 and Aqua One Advance 750 external Canister filters. Open cell foam makes superb water filtration material because it both traps debris and acts as a good home for nitrifying filtration bacteria.