HALF GALLON Super concentrated bacteriological formula - use only 2 oz. per treatment in both black and gray tanks! Let the natural efficiency of bacteria and enzymes keep your holding tanks clean and odor-free. Put the power of this proprietary microbial formula to work for you and see what a difference it makes. The chemical-free solution is accepted at all campgrounds, RV parks and RV/Marine dump stations. Safe to use in all septic systems. Will not harm children or pets. Fresh wintergreen fragrance.