Quote Originally Posted by chem geek View Post
Remember that TA is composed of all alkalinity, both carbonate alkalinity and the alkalinity from CYA (and other lesser components) so even 70 ppm TA is risky if the CYA is high (i.e. 70-80) while at a lower CYA of 30 ppm then 70 ppm is OK. A 50 ppm TA even with a low CYA of 30 ppm, is on the corrosive side (not terribly -- just my being picky), and though this can be mitigated by running a higher CH and a higher pH, I would only do that if the rising pH was a really bad problem. At 50 ppm TA, a CH of 400 and a pH of 7.6 (instead of 7.5) would be better.

Richard
Ok, so it looks like if I go the route of lowering the TA to 70, I will have to keep on top of the CH a bit more than in the past. It's something I used to test once a month since it never really seemed to move way out of wack (ie, always between 300-400).

We'll see how it goes next year. Thanks once again.