I got a wild hair this morning and decided to build up a safety switch to kill the geo should I spring a (serious) leak. Pretty straightforward, a sump-pump float is skinny enough to slip past the fittings in my flow center. A threaded rod sets the height, and as long as there's buoyancy, the microswitch stays satisfied. A nylon bushing keeps the threads from hanging up. I'll mount the switch arm on a pivot attached to the side of the FC so it can be swung out of the way when taking the cap off. My original idea was to mount an ice cube relay to cut power to the entire HP, but it'd be easier to kill power to just the pumps. Would there be an issue if there were no flow through the HP in such a situation? The other switch contact will power a light or alarm, but if I'm not home I don't want to damage the HP by having it continue to run. Thoughts?