It is a super-active mineral carbon deriving from peat, characterized by a surface rich in macropores that guarantees great adsorbing capacity. It is indicated to eliminate odors, dyes, chlorine and ozone in order to make the water crystalline if amber (accumulation of phenols) or foggy (excess of suspended particles) Removes algaecides and proteins, does not release phosphates Compatible Aquarium System Models: Cobra Filter 130 Cobra Filter 175 Duet 50 Duet 100 Duettp 150 2 pieces 2 pieces