Thanks Sean,
Well that's not the answer I was looking for. I do understand the danger of Hydrogen gas buildup. But when there is water flowing through the in line then its also going through the cell unless I shut down a valve in which case the switch would de activate the cell right!!
I dont' want to have troubles down the road. How about plumbing the switch right at the base of the return line? Its below a valve though. Thats how the aquarite book shows it figure #2 page 10 below a valve.
Thanks again for the input.