The Krystal Clear Saltwater System combines a unique two-stage technology to sanitize pool water. First, an undetectable level of 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 side effects of packaged pool chemicals. Second, copper anodes ionize the pool water, creating a biocide that attacks algae more aggressively than chlorine or other packaged pool chemicals. This system features a built-in 24-hour timer. This system requires a filter pump with a flow rate of 700-4000 gallons-per hour.