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] due to risk of bodily harm." (p. 2)
Hmmm? Bodily harm?
Pool: 15k, PebbleTec, bleach & lithium hypochlorite, Florida
I plan to add lithium hypochlorite this evening after the pH gets to around 7.2 (I added muriatic acid this morning.) My water is crystal clear and I have generally been keeping the FC around 2-3ppm.
According to the Chlorine/CYA Chart, my target FC should be 6.8ppm and I should never let it fall below 4.4ppm. (oops)
I (noob) am trying to reconcile the highly educated Chlorine/CYA Chart with Clorox's blunt warning. I'm guessing the answer will be that Clorox's calculation is based on zero CYA...? If so, can I then infer that my higher CYA level results in a lower "actual FC" (if there is such a thing)? For example, if FC reads 6.8ppm with CYA of 60, my "actual FC" is really only something like 3, and thus safe for swimming?
I'm just confused right now as to where I should maintain my FC level so that nobody gets sick or "bodily harmed". Who's right? And how much lithium hypochlorite should I add?