Fluval 306/406 & 307/407 Phosphate Remover. Designed specifically for the Fluval 07 performance canister filter series, Phosphate Resin infused Pads perform double duty as both an effective mechanical and chemical media. Key Features : Specifically designed for Fluval 306/307 &406/407 filters Effective at removing and controlling phosphate Effectively traps floating particles for clear water (debris, excess food and waste) Prevents potential outbreak Custom fit to increase filtration efficiency For best results, replace monthly or as required after testing water with your Fluval test kit Convenient 6-pack format For use in freshwater and saltwater aquariums.