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Chem Geek, Yes, to your question about -.31 in Poolmath. I've been right around that number all summer. It looks like I need to increase my CH for the new recommendation. Will there be an announcement when Poolmath is updated?

THANKS EVERYONE! Here are my current numbers FC 4.2 TC 4.3 PH 7.8 TA 77 CH 240 CYA 75 It looks like I should raise my CH. I was around 300 at closing last year, but I had some scale over the winter (new pool was open for only 60 days before closing) that dissolved on its own within weeks of...

First I just want to reiterate how informative this site is. I just installed a new IG pool last year and I am already more expert on water chemistry than others I know who have had pools all their life. I must say my new pool has indeed been TROUBLEFREE!!! My pool was completed late in the...

I have a new pool with Aqua Blue Pebble Sheen. On the third day after filling a small brown stain appeared on a walk-out step in the deep end. It remained there for a few days and then just disappeared. Everything was fine for about three weeks and then it began appearing again, along with...