I have high CYA (200+), since I havent drained my hot tub since learning about BBB method. (now I am using bleach.) TA is actually very high too (150+) but Saturation Index is close to zero, based on Taylor Watergram.
Taylor explains a "CYA correction to TA" but mentions that "some members of pool/spa industry question its value".
What is this forum's opinion? will a high CYA give a false high TA reading if water balance only concerns the carbonate part of alkalinity?
(I am about at my limit of being able to understand all this - and I know I need to change the water soon )