This product is a special blend of bacillus bacteria. Bacillus is naturally cultured to work within the anaerobic environment of septic systems. This product will facilitate your current biological septic system and promote increased organic breakdown of sludge matter within the tank and along the drain lines. Keep your drain field environmentally sound and functioning properly with ASI Septic Care for as little as $9 per month/per residential system. Packaged in quantities of 6/ per case = 1 year supply.