I've been following the Pool School instructions for closing an inground pool. I've shocked it, added PolyQuat, drained water below the returns and now I need to blow out the lines to add antifreeze and seal them up. I have a shopvac to blow the lines and I just tried it but I'm not sure if I'm doing it right. Am I supposed to put the blower into the hole just beneath the skimmer basket? I tried doing that and the water just blew right up in my face so it got me thinking - that pipe is connected to the pump/filter so I would be blowing air towards to pump/filter and not the returns, right? I'm assuming that's not the right way to do it, so how do I blow air away from the pump/filter and into the return lines? Any help will be much appreciated!!