As the concept and use of decentralized wastewater treatment has advanced, systems are increasingly installed in areas where additional pre-treatment beyond the traditional septic tank is required. This can be due to replacement of previous systems that failed, placing new systems on substandard lots, or building in nutrient management areas requiring water-quality protection. Whatever the reason, today’s service provider will see more of these advanced systems. So it becomes more and more important to know how systems are supposed to work and to be able to evaluate whether the system is functioning correctly.Many manufacturers now require service providers to take
