Yes, Hot Springs. Hmm.You are in Hot Springs, correct? A quick search of the water quality report from 2018 doesn't indicate a high level of iron (or any metal) in the water.
So there were a few rocks in the pool, some change and I noticed a large bolt last night that I can’t really get out unless I get in. I also noticed a rust stain in the shallow end, like something he sat there for a while. Almost looks like a burn with orange edges. Maybe there was something leeching iron in?