It may be that you need new reagents for chlorine, just to be on the safe side. If there is still no change, then Taylor FAS/DPD test kit should be used. The Taylor #s are R-0870 (powder) and R-0871 (liquid in a brown bottle). Keep the powder dry, and the liquid bottle in a dark place.

The only thing you still have to lug are bottles of muriatic acid once a month.

Pat