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
Richard,

I opened my pool this season and am in the process of lowering the TA to 70 (as mentioned above). One number that changed over the winter season is the CH which is now at 175. I have purchased 8 llbs of Calcium Increaser from Walmart which should raise the CH to approx. 200. Should I raise it more or keep it there. My guess is that CYA is at appox 20 (dot never disappears completely but FC has not diminished too quickly). What do you think? As always, thank you.

Alex