I was looking up something else on TFP and came across a comment on CYA - that CYA should never be zero even in an indoor pool b/c having any FC over 2 can be irritating to the skin, eyes etc b/c without CYA it makes the FC harsher or something like that . . . is that true? I did look up the CYA/CL table in Pool School but it doesn't really specify indoor or outdoor and up until now what I have read about CYA was that it stabilized the FC which - when I finally got our pool balanced - I have not had a problem with.
I thought CYA stabilized the FC especially in an outdoor pool when exposed to the sun. But I thought in an indoor pool having a CYA reading of <20 or zero was not a big deal b/c the FC would not burn off as fast anyway b/c of the lack of sun exposure. I have not had trouble keeping my FC levels around 2 to 4, but again in another posting it said that 2 to 4 in an indoor pool without CYA can be harmful to the swimmer . . . is that true? The other post on TFP also said that an indoor pool without CYA should have an FC reading of 0.2 . . . again is that true?
Also, does CYA change with climate? We are in the middle of a Chicago winter, will that lower the CYA or increase it?
I am only concerned b/c my son who is 3 swims in that pool and I didn't realize that having no CYA would be harmful to him. We have never had a problem with him having a reaction in our home pool. I'm feeling a little panicked b/c here i thought I finally got our pool to where it should be and I wasn't worried about the CYA b/c it was indoors and now I have to worry about the CYA. Have I been harming my son? Please help!