Elite Carbon Cartridge for Hush 10 Power Aquarium Filter, 2-Pack Elite hush 10 pre-filtration pad polishes aquarium water while the activated carbon removes discoloration and odors The easy to use disposable cartridge should be replaced monthly Includes 2 cartridge per pack Measures 4-inch length by 3-4/5-inch width by 6-1/2-inch height This product weighs 0.25-pound