The part of this equation that makes the pool pump vs submersible pump argument moot is the cord, a pool pump cord is not supposed to go in the pool water period. Where a submersible pump cord goes in the water to be pumped by design. A kid can't swim up to and grab a pool pump. A kid could swim up to and grab a submersible pump. The pool pumps you show, if they spring a leak the water will dribble out the cooling vents. A submersible pump will be immersed in the water. Using a submersible pump near swimmers is not a good idea, even with a GFI, which have been known to fail, that's why they come with test buttons.
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