Thanks a lot again for the responses. I'm planning on taking a water sample on Monday to get my figures until Ben's kit arrives. Hopefully then I'll be able to post some numbers. About the autopilot, I don't remember reading that the cell is on/off for periods of time, but I guess that would make sense now that I think about it. I thought the % meant that less of a charge was sent to the cell, but now I understand that a % of time makes more sense. You guys are lifesavers. In fact, it's 90 degrees out now, and the pool temp is 86, so it's time for a dip