Saturation Index (Langelier, etc.)

[chem geek]

The TA can be ajusted for CYA and that result used on the watergram so that point is moot.

You are right. I forgot about that. It's been a while since I've used the watergram since I've got my spreadsheet instead. I took a quick look at it in responding to your post and saw the "Total Alkalinity" scale, but forgot they had a CYA adjustment in their instructions so that the watergram scale is really "Carbonate Alkalinity" -- too bad they didn't mark it that way to begin with.

By the way, I'm going on vacation later this week through the next and won't have Internet access so if you don't hear from me, that's why.