My pool company closed our pool, lowered the water a bit below the skimmers, and I put an automatic pool pump on the cover. This is just a tarp type cover with water weights around the pool to hold it in place. It may just be me, but I think that the water level is lower than when the pool was closed. The cover didn't seem to have any holes, but is it possible that my automatic pool cover pump is pulling water out of my pool rather than just off the top of the cover? I unplugged the pump (a Rule H53SP-24 Marine Rule 1800) and it doesn't siphon when unplugged, but I'm concerned about leaving it plugged in. Am I paranoid, or is my concern legitimate?