I have an Esther Williams round pool that I am replacing the liner on. I tried using a shopvac to suction the air behind the liner out, but it didn't do anything. (Yes, I did seal up the skimmer and return holes.) Now, these pools are constructed of interlocking slats, so my question is whether or not the shopvac technique will work because of that. Anyone ever have any luck using a shopvac with EW or JW pools?