The key to use 12 years lies in the purification principle and material of NCCO filter element. The main material of its filter element is recovered clinoptilolite, which can effectively lock and catalyze the decomposition of pollutants. Combined with the active oxygen released by the active oxygen generator, harmful pollutants can be decomposed into harmless water and carbon dioxide more quickly and thoroughly. Because pollutants will be completely decomposed, will not accumulate in the filter element, will not be released into the air again, causing secondary pollution, and the service life of the filter element can be prolonged.