RID-X Septic System Treatment 3-Dose Powder 29.4 ounce is 3 MONTHLY DOSES for septic tanks up to 1500 gallons. Its concentrated powder formula contains billions of 100% natural active bacteria and enzymes that have been selected to effectively digest septic system waste. Over time, organic household waste like oils, grease, protein and paper can build up, causing expensive and disgusting septic backups. RID-X breaks down the solid organic household waste that can accumulate in your septic tank, such as detergents, soaps, grease, proteins and paper. By using RID-X monthly along with regular pumping, you can help prevent expensive septic backups and help prolong the life of your septic system.