OK good to know. I think for the most part, most of the sources I mentioned50 being acceptable on the low end comes from TFP recommended levels, which can be found here: What Are My Ideal Pool Levels? - Trouble Free Pool
Additionally the PoolMath app @ajw22 linked in his post above mine also outlines 50 as an acceptable minimum. If you don’t have the app I highly recommend, it makes calculating additions much easier and if you subscribe also logs your additions so you can view a record of test results/additions/maintenance performed/etc.
agree on general ranges for your pool for CYA and FC but differ on TA.
I will check out the app, Thanks! I am assuming it is available in the android play store.
I am a long time reader of this forum and have done BBB for awhile and the pool always looks great (as long as I stay on top of it)