Dometic Sealand Marine Holding Tank Deodorant and Cleaner4 ounces will treat up to 20 gallons of tank capacity. Effectively controls odors and is environmentally safe. A special blend of biodegradable ingredients controls odors without formaldehyde, glutaraldehyde, quaternary salts or other harsh chemicals. Breaks down waste and tissue. Non-staining liquid formula combines powerful odor control and cleaners with a fresh scent.