The FridgeFresh shall be reactivated at least every 3 - 4 months, preferably every month for better result.  For best result, remove the ceramic pellets out of the case, spread out evenly in a tray and place them in a well ventilated area or under sunlight for a day.  To clean the case, unscrew the plug on the bottom of the FridgeFresh, set the ceramic pellets aside, wipe the case with damp towel, and screw the plug on the bottom of the FridgeFresh back.