Yara PA352LU52 Odorlos Holding Tank Treatment - 40 oz. ODORLOS Holding Tank Treatment, 40-ounce Bottle Just 4 ounces does it all: eliminates holding tank odors completely, breaks down waste and tissue, lubricates valves, and prevents clogging This scent-free, non-staining formula is safe for chemically sensitive people Accepted by all campgrounds, 100 percent biodegradable, Contains no formaldehyde and is also safe for any septic tank system, Liquid formulation, 40 ounce, Tip-N-Measure bottle