PRODEXLAB TREATMENT / DEODORIZER PACKETS BOAT / RV control odors originating from waste water holding tanks (Black & Grey) of RV’s, boats and portable toilets. They are convenient and easy to use. Each packet dissolves in water and will not clog pipes, pumps or valves. Continued use of PRODEXLAB TREATMENT / DEODORIZER PACKETS BOAT / RV will keep holding tanks and sensors clean and operational.