Yep, just checked. Copper not mercury. I was not thinking about the ramifications mercury would have. My mistake. I have ZERO concerns about the SAFTEY of the pool. It completely passes the open eyes test with no burning or irritation, no smell of chlorine at all. Test strips and old fastened mix and match kits agree the water is OK. My niece and nephew (allergic to about everything) have had zero issues swimming.

I suppose I just need to let the issue go until I come across an answer. I may have a profession water chemistry done to be sure. But with all the snow this winter, and rain (more then we've ever had in the winter in NC) there is probably not a drop of original water in that pool. We just had 4 more inches day before yesterday.

I'll stop worrying about the almost not visible floaters for now. Didn't mean to kick up all this dust. Thanks for the concern.