Zodiac APURE35 AquaPure Ei Series Electronic Salt Water Chlorine Generator, 35000-Gallon, 120-Volts or 240-Volts Hard Wired AquaPure Ei series electronic salt water chlorine generator Easy consumer oriented installation Simple, intuitive interface for precision control Automatic reversing polarity helps reduce calcium buildup For pools up to 35000 gallons and 120/240 volts hard-wired; 1-1/2-inch to 2-inch pipe