Eliminates odors and lubricates sensors in the RV holding tank, safe for all septic tanks, RV and marine approved; non-formaldehyde, 8 treatments, (1) 4 oz. bottle treats a 40 gallon tank, Safe for all septic tanks, RV and marine approved; non-formaldehyde, 32 oz. Bottle, 4 ounces treats 40 gallon waste holding tank.