Aqua Kem Green concentrate from Thetford is supplied in conveniently sized 0.75L bottles. The new concentrate version is double the strength of the 1.5L standard bottle, meaning it takes up less space and is easier to transport. Environmentally conscious green fluid for the waste-holding tank. Strong formula that breaks down waste and toilet paper. Keeps waste holding tank fresh-smelling. Septic tank safe (Test ISO 11734).