SU-2000 Water Tank 20008$20.00 SU-2000 Base 20011$35.00 SU-2000 Water Tank Cover 20009$5.00 SU-2000 Gasket 20010$3.00 ION Exchange Replacement Filter We recommend changing the ION Exchange Filter once every 6 months. F-4010$30.00 SU-4010 Water Tank 20020$28.00 SU-4010 Base 20021$53.00 SU-4010 Nozzle 20019$10.00 SU-4010 Water Tank Cover 20022$5.00 SU-2081 Water Tank - Red 20023R$20.00 SU-2081 Base - Red 20025R$40.00 SU-2081 Hygrostat 20026$10.00