electric shock would be my worry, swimmers get killed from stray currents in marinas all the time. most circulators have jury rigged wiring, check it out thoroughly, before you go in.
the stories i read say fresh water is more dangerous than salt. the human body is a better conductor than fresh water so the current goes through you instead of the water. salt water is more conductive than a human, so the risk is lower.
be safe!
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