An Aerobic Treatment Device (ATU) is really a septic system that utilizes oxygen to take care of sewage. ATUs are available in many types, but most consist of a tank which contains baffles or partitions to independent the solids from the liquids. Algal Blooms: Nutrient overloads from failed septic systems https://www.septic-tank-servicing.com/site-map/page/2/