No, there is no need to purchase paper filters for coffee makers manufactured by Bella. The company utilizes reusable and permanent filters that you can use for multiple brews. The exact longevity of the filter depends on its quality, but also maintenance. You want to rinse the filter thoroughly after every use, as well as clean the unit regularly. Some filters are replaceable, but you will need to find the right replacement. If you are wondering how to know if the filter is ready for change, check out the quality of your coffee. If it is bitter than usual, that is the sign you need to change the filter.