We keep finding dead field mice in our skimmer basket. There are two rectangular holes on the skimmer lid that are large enough for field mice to get into so I’m fairly certain that is how they are getting into the skimmer basket. Is there any reason why I shouldn’t put something over the top of the skimmer lid while the pump is running, or plug up these holes with duct tape so mice can’t get in there? And when I find dead mice in the skimmer, is it necessary to increase the chlorine level any before swimming if it is already at target level?