Camco TST RV Toilet Treatment / Drop-Ins helps to break down waste and tissue. Special fragrances has been added to help control odors. It also contains Coconut Oil to help keep sensors lubricated. This product contains no formaldehyde, and is non staining and safe for septic tanks. Our one step, no measuring solution requires no mixing or preparation. Just 4 ounces will treat up to 40 gallons of water. Contains 15 treatments.