Cloudy - shock????

[chem geek]

Even the high FC of 15 in the presence of 40 ppm CYA won't likely fade your swimming suit or have other ill effects. The CYA makes the disinfecting chlorine (HOCl) concentration only 0.36 ppm and that is far less than the 1-1.5 ppm (of HOCl, 2-3 ppm FC) typically found in indoor pools that have no CYA. When my wife uses the indoor pool at the local community center during the winter, her suits do wear out (usually the rubber goes before the suit fades). She does not find any such problem with our outdoor pool that has 15 ppm CYA and typically 3 ppm FC in it.

Now on the other hand, I wouldn't want to swallow this water with higher chlorine levels, but then I wouldn't want to drink pool water in any event. Bottom line is that I think you are safe though this is not conventional wisdom.

Richard

[chem geek]

I must add to what I said in my previous post. I would not go into the water if the CC > 0 (> 0.5 or so) OR if you are still losing a lot of chlorine overnight. Having a high FC with CYA may not be a problem, but if the CC > 0 or you are losing chlorine overnight then this means there is still a lot of stuff getting killed or oxidized in the pool and you don't want to get exposed to that stuff if you can help it.

Richard

[rferrel1]

thanks for all the great advice. We've finally had some rain today. I turned off the filter this a.m. to hopefully let anything that was still being circulated fall to the bottom. I had to pump off some water this morning to keep it from overflowing but my FC was still at 15 this morning. I'm guessing that with the 2 backwashes and letting some off this morning I'm going to need to add some CYA. i'm keeping my fingers crossed to seeing some improvement when I get home.