The problem with non-pool vacs is that they tend to have the wrong combination of flow and pressure. If a shop vac will blow out the lines vigorously, that's fine.
Compressors, not so much. You could rig up a accumulator tank at 10 psi that would work . . . but it would be pretty much of a kludge. The fact that air comes out of a line does not mean the water has been blown out. You need high flow at low pressure; a compressor has high pressure at low flow. Also, if you put compressed air in a line with an obstruction (like a closed valve) you can shatter the line!
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