IN01 has three filters that need to be replaced, and you can get it here. The filter cartridges are washable, and we recommend cleaning and reusing them before purchasing new replacements. We suggest cleaning them every three uses (carefully ensuring they are completely dry before reinstalling). With regular usage (three times per week), the built-in filters can be used for at least six months. If your usage frequency is not as high, you can extend the filter's usage period to 10-12 months accordingly.