You got some good answers, but seriously you want to get your son to respect the pool. Don't know how old he is, but just two minutes ago I heard on the news about a pair of 4 years old twins that just drowned today at the family pool. The pool was still covered, but they found a way under the cover. Kids need to be tought to respect a pool which means don't go near it without supervision and don't touch the mechanical equipment. That is the best way to prevent unfortunate situations.