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Odorlos Holding Tank Treatments break down waste and tissue, lubricate valves, and are safe for any septic tank system, plastic or porcelain toilets, and all holding tank systems. They contain no formaldehyde and are 100% biodegradable and eco-friendly. Odorlos works by speeding up the natural composting process by preventing hydrogen sulfide gases. Just 4 oz. treats a 40 gallon tank.