first off great top off system.. sensors work great but the only problem i have is regarding the top off line. i have a 10 gallon reservoir that i fill with about 7-8g of RO/DI sitting on the ground next to my sump. i have the top off line going up and out of the top of the reservoir and down to my sump. after the pump shuts off it keeps siphoning water into the sump.. not a lot at a time but it keeps dripping. i saw in another thread you suggesting running the line to the overflow box.. is it ok to leave my sensor in my sump?