Chem Geek,

Thank you for the answer. You are correct the SWG is generating slightly less chlorine in this weather in both my and my friends pool 5 versus 6. And your right again the spreadsheet correctly calculates this loss of pH showing I need to add borax, etc. to bring it back up.

But heck I'm saving money and it floats back up naturally so it is actually working well.

Was it not Warren Buffet that said he thinks pennies are important that is why he picks them up? A small difference can grow to a large difference quicker than most persons think. I realized this when reading a book on DNA and how quickly natural selection can change a species. So there is hope for Homo Sapiens after all. Well at least for some.

Aloha