The pool was opened with zero CYA. I tested for it. Before I realized about the degradtion of the CYA I was adding CYA by way of TriChorl pucks in a floater I made. So there could be a low reading of CYA. I have taken the Tricholr out while I battle. Todays readings are after adding 3 gals last night.

Last night after adding 3 gals

TC 19
CC .5
FC 18.5

This AM reading TC 16
CC 1
FC 15

Only used 3.5 PPM last night down from 7 overnight two nights ago and down from 12 from just one night ago but it was distorted by the 2" of rain we had that night. Still brushing every day and backflushing too. Making slow progress.