1. If you are testing with the 10ml sample (=> 1 drop = 0.5 ppm Cl), than a CC reading of 0.5 ppm should usually be ignored.

2. Milky water with high chlorine and low / moderate pH/alk/calc points to filter malfunction. OR, over use of clarifiers or HEDP based metal products. If you've used those, let us know. Otherwise, it's time to check your filter for adequate media level (enough sand or Zeobrite)

Remember, I'm *guessing* about your pool from 1,000+ miles away, based on the info you provide . . . so I can't give any certain, "That's it for sure", answer.