Rid-X 48 OZ Professional Septic Tank System Treatment Liquid Formula Contains Billions Of 100% Natural Active Bacteria and Enzymes That Have Been 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 and Paper Use Monthly Along With Regular Pumping 6 Monthly Doses For Tanks Up To 1500 Gallons.