Check the listing for details. AQUACLEAR - 20 - 30 - 50 - ACTIVATED CARBON FILTER REPLACEMENT INSERT - 3 PACK. Condition: New. Listed at 10.99 USD. AQUACLEAR - 20 - 30 - 50 - ACTIVATED CARBON FILTER REPLACEMENT INSERT - 3 PACK The AquaClear 50, AquaClear 30, and AquaClear 20 Activated Carbon replacement filter inserts are designed to enhance water clarity in both fresh and saltwater aquariums. These filter inserts are specifically created for the corresponding AquaClear power filters (AquaClear 50, AquaClear 30, and AquaClear 20). The primary function of these activated carbon filter inserts is to provide excellent adsorption capabilities, effectively eliminating odors, discoloration, and impurities present in the water. By removing these unwanted substances, the inserts help maintain a clean and healthy environment for the aquarium inhabitants. Each pack contains three replacement filter inserts, ensuring an adequate supply for regular filter maintenance. The net weight of each pack varies depending on the model: AquaClear 50 Activated Carbon Replacement Filter Insert: Net Weight - 210 g (7.4 oz)AquaClear 30 Activated Carbon Replacement Filter Insert: Net Weight - 165 g (5.8 oz)AquaClear 20 Activated Carbon Replacement Filter Insert: Net Weight - 135 g (4.8 oz) It's essential to follow the manufacturer's recommendations and replace the filter inserts regularly to maintain optimal filtration efficiency and water quality in your aquarium.