I bought the Taylor FAS-DPD Chlorine Test kit (K-1515-A) because I had all the other tests I need. I've been using it with 10 ml pool water samples so I am getting readings of 0.5 precision. The FC portion of these tests seem reasonable and are likely correct every time, but I'm not sure about the CC portion of my tests:
Every time I check for CC I get a positive result of 0.5 ppm. Not once have I tested and found 0 ppm CC, yet I thought it was common for residential pools to have 0 ppm CC most of the time.
Are my CC test results unusual?
Or is this a normal / expected result for every CC test?