Flocculates and coagulates suspended impurities in the pool water, improving filtration quality. It creates a layer on the sands that retains the particles that would pass through the filter, preventing transparency. It helps the disinfectant and bactericidal action of chlorine, eliminating particles that could interfere with this action. We achieve the "crystal effect" in swimming pool water. Totally transparent and clean water. Do not use with diatomite filters or cartridges.