You got it
Being a reservoir the head will vary as water level will fluctuate. Point of entry is a single point and realistically we just need to keep it open all winter. I don't know that it matters 10' or 30' hole. The lines are primed with calcium chloride to stand at the ready in fall then reprimed at startup.
I was thinking just a basic entry level vertex unit should suffice? We just need to push a steady volume of a handful of CFM through a couple of holes probably 3/8" diameter and depths less than 20' Since they are at varying depths and the water level varies if we can't quite push to the lowest one at full pool we should be able to get there once the water level drops and it becomes necessary
220v no problem.
