How often must I replace the filter? by Highlands | May 31, 2023 | 0 comments A How often must I replace the filter? Category: Air Purifiers On average the filter has to be changed after 12 months, depending on the intensity of the usage. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.