A CPAP filter captures dust, pollen, and other airborne particles to ensure you breathe fresh and purified air during therapy. Filters come in multiple sizes and types to fit nearly every CPAP machine model. There are mainly two types: reusable foam filters that trap larger particles and can be washed regularly, and disposable fine filters that catch smaller contaminants and should be replaced about every 30 days. Some machines also support bacteria filters for further protection. Regularly replacing or cleaning your CPAP filter is important to maintain clean air,