| Ion-Producing Method | Negative Ion Concentration | Longevity |
| Needlepoint Ionzation | Very high | Stainless Steel = Excellent Other = Fair/Poor |
| Ionizing Wires | Somewhat low | Fair/Poor |
| Corona Discharge | Low | Excellent/Good |
| UV Light | Low | Good/Fair |
Needlepoint Ionization - High-voltage current is applied to metal "pins," causing them to emit a very high concentration of negative ions into the air.
Ionizing Wires - Found in the Sharper Image Ionic Breeze air purifier. An electrical discharge is sent through the wire to generate negative ions. Requires complicated, delicate cleaning every few weeks. Learn more.
(Our XJ-3000C Air Purifier does not use ionizing wires. Therefore, Maintenance is much simpler, and is only needed every 12-24 months.)
Corona Discharge - High-voltage discharge is created by this design to produce a high level of ozone. Negative ions are produced only as a byproduct, so the production is low, and is accompanied by substantial amounts of ozone.
UV Light - Produces germicidal ultraviolet light wavelengths, and can be configured to also produce ozone. If ozone is created, negative ions are produced as a byproduct, but only in low levels.
The Ionizer in our XJ3000-C Air Purifier uses
Needlepoint Ionization.
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