Fluval Ammonia Remover for 07 series are designed specifically for the Fluval 07 external canister filter series, Ammonia Remover pads offer both effective mechanical and chemical media in a convenient, space-saving format.Fluval Ammonia Remover for 07 series+ specifially desgined for Fluval 07 series external filters+ for 107/207/307/407+ 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 to increase filtration efficiency+ for best results, replace monthly or as required after testing water+ convenient 3-pack/6-pack format+ for use in freshwater and saltwater aquariums