You went to bed Saturday night with a clear, blue pool. Sunday morning, you walked outside and discovered something out of a horror movie: green, murky water staring back at you like the swamp from a state park. If this has happened to you, you're not alone. In Florida, pools turning green overnight is one of the most common emergencies pool owners face. I've personally restored hundreds of green pools across Clearwater, Largo, Belleair, Dunedin, and Safety Harbor, and the ca