There are potentially two or three compartments of an ATU that will need cleaning at some point. With some units these compartments may be combined in one tank and separated by a baffle. Never forget that anytime a lid is opened or removed it must be properly secured back in place.The first compartment or pretreatment tank is generally referred to as the “trash tank” because it settles out materials that microorganisms cannot degrade. Pretreatment tanks are designed to store solids and perform limited biological treatment.Pumping out the trash tank is mandatory to remove and dispose of these solids before they
