Water Polishing Pad, 3 Pack for Hagen Fluval 104, 105, 204 and 205 canister filtersFluval A-242For freshwater and marine environments2-7/8" X 5-3/4" X 1-1/2"Fluval Water Polishing Pads are uniquely designed to fit Fluval canister filters. These extra thick micro-fine polyester pads capture micro particles as the water passes through. Use Fluval Water Polishing Pads when the water is cloudy.