Update: My initial "green water" issue resolved itself after several days filtration. I did shock with bleach and deicded to use a borate buffer as is recommended on so many posts regarding SWCG pools. Hoping I can get to a nice equilibrium at 7.7 or 7.8 and avoid the drift with less carbonate alk.

Todays numbers from my Taylor K-2006:
FC 6
CC 0
pH 7.8
Hard 280
Alk (carb) 90
CYA 75-80

But the plot thickens!! After your earlier posts, I tested both the pool and my fill water (hydrant on well) for copper and iron (because those are the test kits I have ) and came up nada on both. I thought I was good to go . . . until I had to put the hose in the pool again this morning and now have (drumroll) slightly greenish water! The goos news, I think I know what it might be - I just need to know what you all think. My well is acidic (about 4.9) so we installed an acid neutralizer for the house to save our fixtures and keep my from constantly scrubbing off the copper stains! These us Calcite (calcium carbonate) in a tank just like a water softner, but the goal is to raise the pH. However, because our pH was so low, we needed a mixed media, 90% calcite and 10% corosex which is magnesium oxide. Could that Magnesium be reacting with the pool water (chlorine) and causing the green tint? I can bypass the neutralizer (what a pain), and plan to in the future for adding water, so I will see what happens next time. What do you think?

Thanks again. Your site had been invaluable to me and I am so pleased to have such a beautiful (albeit currently slight green) pool that I now truly understand!!