Prevent holding tank odor with this environmentally-friendly nitrate-based treatment.Used worldwide by waste water treatment plants, this nitrate compound is an effective way to control odor. The efficient chemistry does not require harsh perfumes or staining colors to work. Just four ounces of this concentrated formula treats 40 gallons. It also helps to lubricate valves and is 100% biodegradable.Treatment type: NitrateDosage: 4 ounces treats up to 40 gallons