Fluval C4 Activated Carbon improves water clarity in fresh and saltwater aquariums. Designed for the Fluval C4 Power Filter, Fluval C4 Activated Carbon provides superior adsorption qualities that effectively eliminate odors, discoloration and impurities.Key Features: For Fluval C4 Power Filter Improves water clarity in fresh and saltwater aquariums Provides superior adsorption qualities Effectively eliminate odors, discoloration and impurities Contains 3 bags, 140 g (4.9 oz) each Net Weight: 420 g (14.8 oz) Other available inserts for the C4 Power Filter: Fluval C4 Ammonia Remover 3 Pack Fluval C4 Bio-Screen Fluval C4 C-Nodes Fluval C4 Carbon 3 Pack Fluval C4 Foam Pad 2 Pack Fluval C4 Poly Foam Pad 3 Pack Fluval C4 Zeo-Carb 3 Pack Fluval C4 Replacement PiecesBFA# HA14013