Clorox Spa® Water Clarifier is a concentrated clarifier that helps make cloudy water in your spa crystal clear. Clears water by making small particles large enough to be easily filtered. After 30 minutes remove the filter rinse it with water and put it back. Recreational water can become dull hazy or cloudy with higher water temperatures and heavy bather volume but the root causes for poor water quality are: Improper water balance Poor circulation/filtration Excess contaminants Low sanitizer levels. Applying Clorox Spa® Water Clarifier to cloudy spa water will help gather all the particles in the water so the filter can better remove them. Remember to test and balance your spa water weekly or even sooner if the spa is being heavily used. If your cloudy water persists contact us to help further troubleshoot.