I had my 24,500 gal, gunite pool built w/ a Pentair Intellichlor IC40 installed in 2007. For nearly 5 years the SWG worked beautifully w/ no complaints. During that time, I've maintained the SWG's sanitizing output levels at 40% w/ no problems. In March of this year I replaced it w/ another in kind.
For the last month I have been struggling to maintain a free chlorine level of 2.0 in my pool. I've maintained my PH (+,-)7.5, CA (+,-)60, TA(+,-) 100, Salt(+,-)3400. I've increased my run time from 8 hrs/day to 12 hrs/day. I've also increased the SWG's sanitizing output level to 60% and recently up to 80%, resulting in little or no change to my free chlorine level.
I have just completed a "Boost" mode, running my sanitizer at 100% for the last 24 hours. My chlorine level is: FC= 1.4 & CC= 1.0.
Is it possible that my SWG is defected? I'm really at a lost as to where to turn from here.