I have a question about blowing out the skimmers from the pump drain using an air compressor. How do you get all of the water out when there is a 6" or so height difference between the bottom of the skimmer and the skimmer weir when its laying flat? Also, do I blow both skimmers out at once or one at a time using a plug? Unfortunatley, I never saw the pool being closed the first two years so I don't know what is typically done.