could someone please tell me how to blow out the main drain...i am using a shop vac and was able to clear all lines except the main drain...i had some trouble with the slide but with the help of my compressor was able to clear the slide....i guess the vac (5hp) isnt strong enough to push the water through....i was looking for air bubbles while attempting to clear and air lock the main drain....NOTHING ,,,, PLEASE ADVISE..... its my first time closing the pool
thanks in advance