I have ordered the TF100 test kit, but am currently using my old Taylor K-2005. For FC, you add 5 drops R001 and 5 drops R002 to 9ml water and shake, then match color. I know my chlorine is high as test strip is at least 10, but the K-2005 is just showing a pale yellow. Could this be due to old reagents? What is the difference between the K-2005 Fc test and the FAS-DPT....