Super concentrated bacteriological formula - use only 2 ounce 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. This 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.