Fluval 306/406 & 307/407 Ammonia Remover. Designed specifically for Fluval 07 performance canister filters, Ammonia Remover pads offer both effective mechanical and chemical media in a convenient, space-saving format. Key Features : Specifically designed for Fluval 306/307 & 406/407 filters Effective at reducing and controlling toxic ammonia spikes Effectively traps floating particles for clear water (debris, excess food and waste) Ideal for new and heavily stocked aquariums Use after medicating fish Custom fit for 07 and 06 series filter to increase filtration efficiency For best results, replace monthly or as required after testing water Convenient 6-pack format For use in freshwater and saltwater aquariums.