 Commercial and industrial facilities that discharge toxic pollutants to the treatment plants may be very detrimental to treatment plant processes and the environment.IUs which discharge pollutants into the POTW are required to install, operate, and adequately maintain pretreatment equipment to remove pollutants that could otherwise damage, obstruct, interfere with, or pass through the POTW.Examples of such pollutants include heavy metals, cyanides, toxic organics, and acidic or basic wastes from industrial operations.