The BIOROCK compact treatment system consists of a septic tank and treatment unit. Bacteria develop slowly and naturally in the septic tank in the absence of oxygen (anaerobic). The addition of activating products is not necessary. At the end of the first year, the production of sludge will reduce significantly. When emptying the septic tank, the professional will leave a small quantity of the effluent at the bottom to allow for faster start-up. No product in any form whatsoever should be added to the treatment unit.