I have an inground pool also.
I have two return lines and three outlets in the pool. I drop the water level about 2-3 inches below the skimmer line. Then blow out the lines from the filter area. I have someone on the "pool" end and after blowing the lines have someone quickly cap the lines. Two of my return lines are connected together undeeground. That us what I suspect yours is. When you blow out the lines that will tel if they are connected. AFter you blow out the lines pour a gallon in that single return. Blow out the line that goes to your skimmer. You can buy a thing callled a "giszmo". It screws into the skimmer so ice wouldnt crack skimmer area, then I poutr so antifreze in the skimmer housing.
Hope this helps
Mike
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