Walex Toi-11530 Bio-Pak Holding Tank Deodorizer - Fresh Scent Pack of 10. A waste digester that removes odors and rapidly breaks down waste and paper these Hygiene and Sanitation by Walex also cleans sensors and lubricate valves for smooth operation all while preventing formaldehyde formation. Prepackaged portion control means no spills ensuring you have the exact amount you need without the risk of spills keeping you safe and saving you time and effort. Ensure your holding tanks are functioning their best even after miles and miles of traveling when you treat them with the Walex Toi-11530 Bio-Pak Holding Tank Deodorizer - Fresh Scent. Features of Walex Toi-11530 Bio-Pak Holding Tank Deodorizer - Fresh Scent Ideal for RVs and boats Removes odors and breaks down waste and paper; Cleans sensors and lubricates valves Biodegradable and Formaldehyde-free Prepackaged portion control- No Spills Quantity: 10 Pack Package Contents: Walex Toi-11530 Bio-Pak Holding Tank Deodorizer - Fresh Scent Walex BIOPPBG: Toi-11530 Bio-Pak Holding Tank Deodorizer - Fresh Scent Pack of 10