Quote Originally Posted by PoolDoc View Post
It could be 99% dichlor dihydrate which would be 55% available chlorine. If so, it's fine.
That appears to be correct. So after 4# of CYA last night and a 1# bag of dichlor first thing this morning, here are the latest numbers. (and I think I am getting it right, but still need to go get bleach)

Free Chlorine 6.5
Combined Chlorine 0.5
PH 7.2
Total Alkalinity 90
Calcium Hardness 390
CYA (Stabilizer) 50-55

(Copy/Paste from my spreadsheet... sorry)

So I will check it again in the morning and see what, if anything, I lose at night and one more time tomorrow after work to check daylight loss. But I am feeling better about things. Algae seems to be gone (or at least under control) and let's hope I have the persistence to keep this up.