Activated carbon impregnated filter pad effectively traps large particles, removes discoloration, odor, pollutants, and harmful chemical to keep your aquarium crystal clear · DIY Cut-to-fit filter pad, good to use in freshwater and saltwater aquariums. · Works with all filters: canister, hang-on filter, wet/dry, pond filters, DIY filters · To ensure optimum performance, replace the filter pad every three to four weeks depending on waste load of the fish tank DIMENSION: 18"x 10" |