My CYA levels went from 30 ppm in April to 135 in about two months, but I was unknowingly using tri-chlor shock that was also contributing CYA.

I am switching over to non-stabilized shock (Na and Ca hypochlorite) but still want to use the FROG as you suggested. After draining my pool this week I cut the CYA in about half (50-60) with test strip. I ordered the Pool Solution kit on Tuesday and hope to closely monitor this in the future!