The cartridge is the main component and is installed at the base of the urinal. A biodegradable sealant liquid is contained within the cartridge. A barrier is formed between the drain and the open air by the liquid sealant, eliminating odors. The cartridge is designed to collect uric sediment, the remaining liquid, which is non-corrosive and free of hard water, is allowed to flow into the drainage pipe. The result: no wasted water and an odor-free environment. Maintenance is performed by replacing the cartridge after 7000 uses with a provided key. It's that simple! Kits include one cartridge, plastic key, sealant, disposal bag, plastic glove, instructions Sloan WaterFree Urinal Brochure