On a statewide basis, ATUs with surface application are often the cheapest and easiest system to install. They are, due to ignorance of the issues, the system of choice for most builders.
When a surface application field won't fit due to site constraints, the most common solution is to use the same ATU, tanks, and controls, but use subsurface drip dispersal fields instead.
The homeowners of such systems are not aware of their limitations, and are understandably dissatisfied when the system limitations result in alarms, soggy yards, or bad smells.
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