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HI there! This unit, the 211+ already has carbon in its filter. You'll want to replace the filter after 6 months of use. There is an internal timer that will let you know when it's time to change the filter (the button on the unit will change color when it is time).
Sorry, there was a problem. Please try again later.It should be every 6 to 12 moths or the device will let you know when it’s full and needs to be replaced
Sorry, there was a problem. Please try again later.
