Harness the power of citrus to stop odors and break down waste in your RV or marine waste holding tank. Ultra concentrated formula-just 2 ounces treats a 40-gallon tank. Convenient 4 oz. Bottles. Eight bottles per box. - Eliminates odors and breaks down waste in the RV holding and marine waste tanks - Powerful citrus formula with fresh citrus scent - Requires no mixing or measuring, each bottle treats up to 40 Gal. - Ultra-concentrated - Contains 8 single dose bottle of 4 ounce each