Where can green algae in pools be found?

• A. Only on water surface
• B. Only on bottom
• C. Found free-floating or attached to walls
• D. Only in the filter media

Answer: (C)

Green algae in pools can exist in two forms: free-floating in the water and attached to submerged surfaces like walls and the floor. They aren’t limited to just the water surface or the bottom, and they aren’t confined to filter media. Free-floating algae make the water look green and cloudy, while attached algae form a slimy green film on walls, tile, and other surfaces. Both forms can appear when circulation is poor or sanitizer levels are too low, so you treat both by improving circulation and filtration and by maintaining proper sanitizer and pH to prevent and remove algae growth.