Yes, I got the high chlorine test kit from Leslies. It says it tests from 0-20ppm. It comes with Taylor R-0870 powder, R-0003, and R-0871 FAS-DPD. Will this test past 20ppm?

I am brushing at least once a day and running the filter constantly. I can't backwash since I have a cartridge filter and no backwash valve.

This morning my chlorine tests at:

FC 21
CC 0

I will keep putting in chlorine.

Thanks for the responses.