Automatic Water-Removal Pump
Cover-Pools systems use an automatic pump (required for A.S.T.M. safety standards) to conveniently remove standing water that may accumulate on top of the cover as a result of rain, sprinklers or cleaning. The pump automatically turns itself on when water is present and shuts off once the water has been removed. Dirty water is drained away from your clean pool. When you're ready to swim, the cover is ready to go.
(Photo is a representation of a water-removal pump. Actual pump may vary.)