This is my first year with a pool, i opened and maintained it myself, and now its time to think about closing. I was planning on using an air compressor to blow out the lines. From what i have been reading, I can just thread the air compressor into the pump's drain valve. I have a hayward super pump, and there seem to be 2 drain valves- one on the front ("short" side of the pump")almost directly below the suction pipe, and the other is on the "long" side of the pump. Which valve would I connect the air compressor to??