Replacement Plasmacluster Ion Generating Unit for IG-840. This is a plasmacluster ionization unit that requires constant replacement to emit stable and high concentration plasmacluster ions. IG-840-W Plasmacluster Ion Generator Total Operating Time: Approx. 17,500 hours (24 hours a day of continuous operation for 24 hours a day), the lamp of the unit will flash and notify you when the unit is replaced. Operating will stop after about 19,000 hours (about 2 years and 2 months). The replacement period may be faster depending on the environment of the generator and where it is used (where oil components are levitated such as edible oils, locations with a lot of dust and humidity, and areas that use sprays or chemicals.