Aqua One Sponge Pad Advance 1050/1250 (2pk) - 403s

Use this Aqua One 403s sponge with both the 403w wool foam & 404s Fine sponge to ensure you have clear healthy water. More properly called Aqua One Bio Foam the open cell, black or blue foam produced by Aqua One to fit your filter is especially designed to fulfil two key filtration functions. The first function is to trap solid waste without which your aquarium would never be clear and the second, even more important function, is acting as a home for nitrifying filtration bacteria which process the toxic Ammonia your fish produce as a dissolved waste product. Use only Aqua One genuine replacement parts in the Aquis CF 1050 / 1250 range of Aquariums.