Based on your good pool conditions, I would raise Cl to 15 or so ppm after the Sun is off the pool. The next AM, test again..... your Cl will probably have dropped noticeably and the CC should be zero.
If so, let your Cl drift back down into the maintenance range (3-6ppm) on it's own.
PS - don't be concerned if you still show .5 CC.....that seems to be somewhat normal and I wouldn't worry. My bet is you'll be at zero, however.
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