Thanks Carl. Yes, the Pool Calc does help me. A microbiologist by education and training I prefer precision rather than guesses. Using the Pool Calc I know just what and how much of something to add and can avoid the try-this-see-if-it-sticks method. That one works, no doubt, it's just not as cost effective as I like my pool maintenance to be.

I've been running trichlor pucks since we hooked up the equipment early in May and am now at 50 ppm. It took seven 3" pucks, not bad. no negative effect on the pH which is consistent at 7.5. I'm stocked up with LC and ready for a hot summer, starting now. It's in the mid-90s here in the Lehigh Valley. How are you doing in Jersey?