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  1. V

    Can't get CC below 0.5 ppm

    I've SLAMmed it several times, and the best I can do is 0.8. If I don't SLAM on the reg, it will be between 1 and 2. I figure I must be doing something wrong for my setup. Here are the factors that I think are influencing my process: My < 1 year old tub came with an ozonator It's under a tree...
  2. V

    How to test for Combined Chlorine when Free Chlorine is high

    My CC tested 0.6 on a FAS-DPD test using a 25mL sample. If I understand correctly, the recommended approach to reducing CC when greater than 0.5 is to shock to 12ppm FC. I'm not sure if this is technically SLAM, but assuming I need to maintain 12ppm FC (or whatever the CYA/FC table specifies)...