Question:Does anyone have any experience with ATUs that use what is essentially an agitator for aeration? I am wondering about odors, and about their ability to handle shock loads. I do designs for holiday homes, and some ATUs really stink when you fire up the plumbing on a long weekend after being away for a month. Answers:I have some. The aerator is a motor with a hollow central shaft that incorporates a hollow tube with an aspirator at the end down in the mixed liquor compartment. They also incorporate a fixed-film media that supports microbial life. Typically the aerator runs
