Thanks for the answers about why I need more CH in my pool water. Now I understand. I've been reading even more here and have even more questions.
For reference, here are my Taylor K-2006 test results.
FC - 3
Salt 5590 tested this one twice.
Pool temp is 52F
Intellichlor IC40 currently running at 5% 12 hours per day except when freeze guard kicks in.
The pool is in a screened enclosure so only tiny seeds and airborne dirt/dust get into the water.
The pool gets plenty of shade during the day from surrounding trees. Full sun at a maximum of half of the day.
I'm beginning to wonder how much I need to do while the temperatures are still so low. I have a heater and plan to turn it back on next month. Mechanical reasons caused me to turn it off for the time being.
For now, I plan to add CYA. This is why I no longer have a pool guy. We had a big argument about needing it at all. I also plan to add borax to keep down the increase in PH during the season. My goals are as as follows:
Increase CYA to 60 ppm
Increase Borax from 0 to 50 ppm
If I read correctly, all of the other things that I test for will change when I add these two things. I'll re-test and then add items to get:
TA to 60
CH to 300
Am I wasting my time and effort with the pool so cold? Should I just wait until I begin heating before messing with any of these items?