GFCI's trip, but you have to remember that you are installing systems in schools where many people gather, and possibly poke around in the tank with water.
You got more than a GFCI installed, like a gizmo that will shunt trip the mains?
GFCI's don't always work, so you need to back yourself up.
No way would I put something in a school, unless they understood everything, and that would include electrical!!!
