I posted here several weeks ago about high CYA and advice I was given by pool store. With your spot on advice (and not what the pool store told me), my pool is now pristine, and I am off all pool store chemicals, including trichlor. I'm using bleach to sanitize.
Here are my latest #s:
FC - 8
CC - 0
pH - 8.0 (may be a bit higher - but at least 8.0)
TA - 125
CYA - 140
Borates - 30 (used testing strips)
I have added 1.5 gals. of 8.25% bleach this evening to raise the FC; my target is 8-15. Do I need to lower the pH? The CYA is slowing coming down a bit..from a high of 170, as is TA, from a high of 150. pH has been consistently at 7.8-8.0 since early July.
Thank you so much for a great website!
15,700 gal. vinyl in ground pool, Hayward Max Flo XL pump