My daughter asked me to test her pool. It is one of those blow-up the ring and fill it, kiddie pools. 1018 gallons. Her father died a week ago and she has done nothing to it since that time except add chlorine tabs “to the floaty thing”. SMH. The water looks great but here are her test numbers: FC 4.0, pH too low to measure, CYA 30, TA 60, CH 90. I was going to plug those numbers into my Pool Math app and get her back on track, but I don’t know what to put for the pH. Any suggestions?