Now that I have the TA down the FC consumption has dropped to about 1 - 2 a day, before I was hitting SLAM level just to get through the next days burn about 6 - 8 a day. CYA has been steady and I have not added. Days are getting shorted and the pool is starting to cool down (90 - 86) a bit that may also be playing a factor.I know your main focus seems to be on pH right now and you are getting good advice there, but I wanted you ask you a little more about your chlorine consumption. Is there a particular reason you are raising FC to SLAM level every day? You mentioned you have higher FC consumption than you felt should be happening, but before this started did you have any signs of algae? (water a little cloudy, "dust/dirt" accumulation that poofs when you brush it, visible algae on the walls or floor of your pool...) I'm just wondering if you may have also been dealing with the start of an algae outbreak which would explain the higher chlorine consumption. If not, then it could just be that chlorine burns off faster at higher FC/CYA ratios or that your CYA level is not high enough to protect your FC from the desert sun.
Pretty sure I am not dealing with algea since FC is holding at night and CC of .5 is only occasional.
We have had a few visits by monsoon so dust and tree debris may also be a factor.