I have the entire TF-100 kit. I did the chlorine drop test on the first day. It was a dark purple if memory serves, it didnt change after 50 drops. In order to conserve the solution ive only been doing the k-1000 every few days to see if the FC has come down to the point where it registers, or even changes colors. The salt and swim is disabled, so there are no other sources introducing chlorine into the pool. Thank you for all the assistance, I sure appreciate it.