Krystal Clear Salt Water System with GFCI Provides sanitized &amp; sparkling, chemical-free pool water. No more red eyes or adversely affected hair, clothes &amp; pool liners. Produces natural chlorine from saltwater which attacks bacteria. Copper ionization feature releases highly active disinfectant ions which creates a potent biocide and attack algae more aggressively than chlorine alone or other packaged pool chemicals. 110~120 Volt - Self-Cleaning Titanium-Coated Electrolytic Cells, for continued performance New GFCI outlet feature adds additional safety and security