Quote Originally Posted by reboot530 View Post
Anyway I was reading the booklet and it says do not run the filter while people are swimming. Why is that?
I think it's the electrical issue + the US legal system -- attorneys in the USA look at swimming pools as a gravy train, and have established a legal history of successfully collecting millions from any corporation with the slightest connection to the pool where the accident took place.

Ironically, the greatest danger of a shock comes, not to swimmers, but to any one leaning against the metal frame. But it's small. Of course, the risk of being hit by lightning in the middle of a ball field is also small, but people do die that way.

Personally -- and since nasty legal botflies (NSF-Watermom -- really, don't click the link unless you have a strong stomach!) may be reading this, this is not a recommendation but is ONLY a personal observation -- I'd get a good inline GFCI, test it regularly, and not worry about turning the pump off. But, that's just me.

Here's what I'm talking about
Coleman Cable 02841 In-Line Tri-Source 12/3 SJEOW 2-1/2-Foot 120-Volt Ground Fault Circuit Interrupter @ Amazon