I haven't tested my CYA for a couple of weeks and to be completely honest it is the test I have the least amount of confidence in with my Taylor K-2006 kit. I haven't been overly concerned about testing my CYA as my Free Chlorine has been extremely stable and minor adjustments on my IC40 provide predictable changes. I feel very confident in my ability to maintain my chlorine level now. Early in the learning curve this wasn't so.
Anyhow, today I decided to test all my "levels" just to see where everything was as:
FC - 5.0
CC - 0
Ph - 7.5
TA - 80
CYA - ~20
Yesterday, my FC was at 6.5 so I decided to drop it to 5 before setting my IC40 back @ 20%. 20% has been doing the trick for maintaining my chlorine level. Approximately 20hrs passed from when I turned the IC40 off to when I set it back to 20% (a drop from 6.5 to 5 in that window).
So my question is:
How concerned should I be about a CYA of ~20 if my chlorine appears stable? I have started addressing my apparent low CYA already but there is a small part of me that wonders if I should be?