| Other then an oil filled pump leaking the only other thing I've heard of is of course electrocution from a short. So the cure for that is GFIC. Of course GFI isn't fool proof. If you don't test them every now then you may not know it is broken and then the pump might fail and the koi get shocked. Sometimes when I shut down my pumps for filter cleaning I like to do it by hitting the test button on the outlet to make sure it's still working. I think if I had a submersible pump I would do it that way quite regularly.
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