WOW that sounds just like my pool exactly. So what to do. I read it. I have had levels up to 25 for three days now. Still some cloudiness, and brown trying to go back to the bottom. OK. So if I now get rid of it, and I let my chlorine level go back to the norm for swimming, wont it just return? WOW. MY bil has the same stuff. We live on a dirt road so I thought it was just dust. And also mowing the lawn. Geesh. What a mess. Thanks for the link though. At least I know its algea and not dust/dirt from the rd. Going to go and increase chlorine even more. Thanks again.