We recommend replacing the filter after 6-8 months of use but it would also depend on your atmosphere condition. The check filter indicator will light up when it's time to change your filter.

There is no recommended time for replacing the filter because it is dependent on your atmosphere condition as dictated by the unit during your use of the item. Just make sure to clean your filter and your unit from time to time, as prescribed in the manual, to keep the good condition of the item.