Key Features Interpet replacement filter foams and carbon foams fit the PF range of Internal Power Filters. Each box has a complete set of either white filter foams or black carbon foams to fit the relevant PF filter. Using filter foam ensures effective mechanical filtration in the aquarium filter that ultimately produces healthy and crystal clear water. Replacing these foams on a regular basis ensure the filter is kept to its best and lowers the need for constant cleaning and maintenance. Specifications Fits the PF range of Interpet Filter Foams