Hi everyone,
I can't seem to get my chlorine level to come up. I tested my water and added a total of 8lbs of stabilizer because I showed none. I have shocked with gallons of pool bleach and pounds of granular shock. I have metal staining, I have cleaned with ascorbic acid and added metal free. The stains return after a week or so. The water is clear and looks great. My ps233 test kit is a few years old, but I have replaced most of the reagents at some point. I'm not sure how old my R0013 is, but probably at least 2 years. The pool store says my cya is over 100 and that's why I can't get it to shock. My test shows in the 50 to 60 range. Could my r0013 be degraded and giving me bad readings? I am using trichlor pucks in my hayward feeder. Should I switch to a non-stabilized tab? Changing the water would be difficult. I am on a well.

18,000 gallon inground vinyl lined, hayward super pump, hayward de filter, hayward chlorine feeder, raypac heater
fc=0.5, cc=1.0, tc=0, ph=7.4, alk=70, cal=120, cya= 50-60

Thanks for your help, Marty