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I've been using the digital ColorQ Pro-7 pool tester for about a month (after getting a new PebbleTec surface). Based partly on this thread, I also purchased a TF-100 to compare the two and because I have heard it's more accurate, especially for CYA (stabilizer). For those who don't know, the...

I'm sorry if this has been answered already. I've been searching for awhile without luck... Everything I've read in the Chlorine/CYA Chart thread makes a lot of sense. However, the Clorox Service Bulletin clearly states "Re-entry to treated pools is prohibited above 4ppm [available chlorine]...