Rid-X, 39.2 OZ, Professional Septic Tank System Treatment, Concentrated Powder Formula Contains Billions Of 100% Natural Active Bacteria & Enzymes Selected To Effectively Digest Septic System Waste, Breaks Down The Solid Organic Waste That Can Accumulate In Your Septic Tank, Such As Detergents, Soaps, Grease & Paper, Regularly Will Help Keep The Bacteria Population Consistently High Throughout The Year, Use Monthly Along With Regular Pumping, 39.2 OZ 4 Monthly Doses For Tanks Up To 1500 Gallons.