PAK-BOSS Treatment / Deodorizer controls odours originating from waste water holding tanks (Black & Grey) of RV's, boats and portable toilets while breaking down waste and paper.PAK-BOSS Treatment / Deodorizer is convenient and easy to use with no messy spills.Each packet dissolves rapidly in water.Continued use of PAK-BOSS Treatment / Deodorizer will keep holding tanks and sensors clean and operational, and ensures that pipes, valves and seals will be trouble-free.