Starbrite - RV Odor Away Nitrate Holding Tank Treatment - 8 oz. - 76308 Star brite Odor Away Holding Tank Treatment uses natural nitrate compounds to accelerate the waste breakdown process while eliminating offensive odors. Nitrates are an environmentally friendly way to treat waste. Features: Size - 8 oz. Formaldehyde-free Breaks down waste & tissue Biodegradable Directions: Shake well before use. Holding Tanks: Add 4 fl. oz. (118 ml) of Odor Away Holding Tank Treatment to one gallon (3.78 L) of water for every 40 gallon (151 L) tank capacity. Portable Toilets: Add 2 fl. oz. (60 ml) of Odor Away Holding Tank Treatment in 1 to 2 quarts (.95-1.9 L) of water. Note: Thoroughly rinse the holding tank prior to starting a new type of treatment. 8 oz: Treats up to 40 Gallons 32 oz: Treats up to 320 Gallons 64 oz: Treats up to 640 Gallons