This eco-friendly pool water sanitizer with new Copper Ionization Algaecide Technology represents the newest generation of saltwater systems. Undetectable levels of chlorine are produced when salt is added to pool water and passed through the filtration process. Highly disinfectant ions are then released to attack algae more aggressively than other packaged pool chemicals. The result is fresh, clean water that is swimmer-safe and all natural. Requires a filter pump with flow rate between 700-4,000 gph. Includes 20 test strips to check performance. 24-hour auto-clock cycle.