Fluval Fine FX5/6 Water Polishing PadFluval polishing pads are uniquely designed to fit Fluval canister filters. These polyester pads capture small particles and help maintain crystal clear water. Use Fluval polishing pads after using Filter Polishing Pads to maintain water clarity. For freshwater and marine environments Place in top or middle media baskets Effectively traps micro particles and debris for crystal clear water Compatible with FX 5 and FX6 filters.