Drop a Scum Bug in your spa or hot tub to witness its power to clarify! Using technology originally developed to clean up ocean oil spills, this floating foam collects water contaminants that create scum lines, cloudy water, and clogged filters. The scum bug floats on the surface of your water and quickly dissolves your scum and the worries it causes you. When the Scum Bug becomes saturated, simply rinse with fresh water and wring out (not in spa), to prolong the life of your Scum Bug.