Fuval/Aquaclear 50 Filter Media Maintenance KitFluval AquaClear 50 media maintenance kit contains four of the best filter media available. The kit includes: 1 x Biomax (4. 41 oz 125 g), 2 x Activated Carbon (2. 47 oz 70 g) and 1 x Foam Filter inserts. This filter media is ideal for aquariums up to 50 US gal (190 L). Key Features: BioMax Filter Insert provides an optimal environment for the colonization and growth of beneficial bacteria, which is essential for effective biological filtration and