TetraTec Replacement Bio Balls BB600/700/1200

TetraTec BB Bio Filter Balls are a specific biological media, providing an excellent environment for friendly bacteria to break down ammonia into harmless nitrate. Because they are not too porous they allow a good flow of water through them, which ensures that all the bacteria receive a supply of oxygen and nutrients. This keeps them working effectively, and avoids ‘dead areas’. Clean in aquarium water only, as and when necessary.