Fluval Water Polishing Pads are, uniquely designed to fit Fluval, Canister Filters, These extra thick, micro-fine polyester pads, effectively trap micro particles, and debris as water passes, through, Fluval Water Polishing, Pads are ideally used when, cloudy water occurs or after tank, maintenance, Fluval Water Polishing Pads Features and Benefits:, - Durable micro-fine polyester pads, - For freshwater and marine, environments, - Traps micro particles and debris, - Provide crystal clear aquarium water, 4, 5"" length x 4, 6"" width x 7, 4"" height* SKU: RCHG0518