All Air-Zone water ozonators use our U.S. Patented ozone elements made specifically for these water ozone purifiers. They feature a closed type of electrode design so they will not be oxidized by the ozone and should last many years.
The new type water ozone elements are used in the XT-1800W and the XT-5600W purchased since January 19, 2010.
The XT-1800W has 2 elements.
The XT-5600W has 4 elements.
The U.S. Patent Number for the water elements is US 5,502,346.