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.
