I'm new to both this forum and pool ownership. I would like to get your experienced opinions on what might have caused these stains in my pool. I have a 7,000 gallon gunite pool which has been under the care of a local pool company. The pool is almost 2 years old (though I've only owned it a short time) and it has looked beautiful until very recently. I left town for 6 days and upon my return, I found these big splotchy stains in the bottom of the pool (some sprinkled stains on the steps too).
I'd appreciate your thoughts as to what could have caused this.




Thanks!