Rx400 Replacement Cartridge

This is the replacement cartridge for the Rx400, UV400 and Med Air 400. The cartridge should be changed when the indicator light turns from green to amber or steady red. This occurs typically after 8800/9000 hours of operation (1-4 years based on daily hours of use). You must unplug the unit for one minute to allow it time to reset after installing a replacement cartridge.