Matrix Swimming Pool SolutionsSpa Sludge OutOrganics like oils, lotions, cosmetics, hair products and sweat can not be metabolized by your spa. They build up in the lines and on the filter causing bad odors, foaming and filter clog. Instead of using defoamers, extra sanitizers, and fragrances to mask these problems as they get worse, Sludge Out solves these problems at the Source. It's impossible to completely keep these contaminants from entering the spa, but by using a weekly regimen of 2 ounces of Spa Sludge Out, you can keep these impurites from building up in the system.