I have closed my pool, which is an above ground pool that has a deep end underground with both main drain and skimmer lines, my question is after i closed the pool this year, i went and looked into skimmer bucket and checked the pipe that runs from the skimmer into the pump. Last year when i did this, about a month after i closed the pool, there was water in line (not in skimmer but i could i see down at bottom of the pipe) and went ahead and sucked it out with a dyson. this year i did the same thing, friday i checked, there was water in the line so i sucked it out, 5 days later there was more water in the line. my question is where is the water coming from? the skimmer has a plastic cover, but i doubt if not water is seeping around edges of the cover and getting into skimmer basket and down into the pipe that way. the other way water could be getting into skimmer line is by leaking from main valve which is shut off to form the air lock. however, when i sucked the water out i didn't hear any bubbles or issues from the pool. any suggestions out there.. thanks for any help.