TETRATEC EX600-700 BIO FILTER PAD BLK

The advanced Tetratec BF biological filter foam is designed to be used with the tetratec EX400, EX600, EX700 and EX800 External filters. The highly advanged biological foam provides a large surface area for the growth of benefical bacteria. Removes harmful substances e.g. ammonia and nitrite. Mechanically removes medium size particles from the water. Contains 2 foams per pack.