So we have a pool company coming today to close our pool. They wanted the pool drained to just below the skimmer. I backwashed this morning and lowered it to the bottom of the skimmer plate, then turned the pump off. I just went out there an hour later and the water level now looks to be an inch below where I stopped backwashing? Is this normal? What could cause that to happen? We’re in Michigan and expecting a ton of snow so I’m not worried about the level being too low, but now my returns are halfway uncovered.