So, what potentially "causes" high CYA levels if you are using liquid bleach?
Here are the details:
IG Pebbletec Pool, roughly 8500 gallons. pH was high, but I have brought that down to 7.6. TA was high to, although I have not rechecked it in a few days. Water clarity is, and always has been beautiful. (even when algae starts to bloom in a few spots due to my carelessness).
For the last year or so, I have used 99% liquid bleach for chlorination. The exception is the commercial granulated stabilized "shock" product that I have used, literally, 2- 3 times in that year (one pound bags).
I measured my CYA at 70. I may need to get the hang of the test better, but that is close. Since I doubt the very very minor amounts of shock I have used are the culprit, what else causes 'high' CYA, and more importantly, is 70 really that high?