The Krystal Clear Saltwater System combines a unique two-stage technology to sanitize pool water. First, an undetectable level of natural, swimmer-safe chlorine is produced when natural salt is added to pool water and passes through a titanium coated electrolytic cell during the filtration process. The result is soft, fresh, clean water without the potential hard side effects of packaged pool chemicals. Second with the copper ionization feature, highly active disinfectant ions are released which create a potent biocide and attach algae more aggressively than chlorine or other packaged pool chemicals.