I have finished a complete drain and refill recently due to metal staining and high CYA. After some discussion my husband wanted to use the trichlor pucks to gradually raise the CYA instead of adding it separately. (We have leftover trichlor pucks from before the drain/refill) Using the pool calculator I figured that adding 8 pucks would get us up to around 15ppm (The TF-100 was showing the CYA as zero) even though it would raise the FC significantly. I was tired of having to add bleach constantly because the FC was dropping back down every day. So I added all 8 pucks a few days ago and now the FC is 7 and the CYA (near as I can tell) has gone up slightly. Since the mixed solution is not completely clear like it was initially I'm guessing my CYA to be around 5-10 at this point. (I can still see the black dot but it's barely visible with the tube entirely filled)
I see on the CYA/Chlorine chart that I've way exceed the "max" level. What does that mean? It's toxic and unsafe right now? How does CYA affect that? I'm asking because I've read elsewhere that in some states public pools are allowed to stay open as long as the FC is 10 or less. So 7 doesn't seem hugely excessive unless I look at the CYA chart. Am I at risk of damaging something in my pool? We have guests coming tomorrow evening so I'm thinking I'll take the pucks (what's left of them) out of the skimmer and seeing where our level is at by noon or so.
Thank you in advance for your help.