Chem Geek - Your above Pentair IntelliChlor link shows CYA 50 - 80 PPM (page 10). I have the same Installation Guide and my booklet shows CYA 30 - 50 PPM (page 10). I have an IntelliChlor IC-40 Ver 3.02 installed 5/2013 manufactured 7/2012. Has Pentair changed their CYA recommendations? I've been holding my CYA at 40. From this thread, should I increase it to 50+ ?