You can sort of see my setup here. Bottom left shows the pump and the skimmer/floor drain lines where they intersect before going into the pump. I assume that blowing in reverse then closing the valves will get the water clear of those lines. Then I put the cap/plug in the skimmer hole.
As far as clearing the returns, where do I apply the air? Through the hole going the other way into the pump? What setting on the filter do I use during this step?
Mainly I want to know if I drain the pool down to below the skimmer then do this (not concerned about water table), or do I drain using the floor drain, closing the skimmer when the water gets down, then blow out the lines?
I have an air compressor, I'm assuming some sort of "plug" fashioned to fit in the hole and blow air through will suffice.