This pool is driving me crazy!!!!!!!!!!!!! I walked out and found that the pump was sucking air-I'm assuming. I turned it off and checked the o-rng for the strainer pot-relubed it. Checked the water line-two inches above bottom of skimmer. Also checked the strainer pot lid-perfect condition. I primed it and turned her on and after 30 sec water started to shoot out the air relief valve and the strainer pot was full and THEN! WHOOOSH-the water went back down the inlet pipe coming into the strainer pot. I then proceeded to use a drain flush thinking that might work-it didn't. I'm thinking it might be the main drain thts plugged with leaves or something. There are no leaks around the pipes. Each drain has its own ball valve. I appreciate everyne who gies me the time and energy for letting me pick their brain.