Yes that is possible and free of charge in the first month after purchase as long as the filters are still in new condition. The Pro 10, 15, 17, 20 and 26 can be interchanged. So can the Pro31 and Pro27. It is not possible to change the Pro27 or 31 to a lower attenuation filter than Pro27 because the mould is shaped differently. If you have purchased any of the ER series it is possible to change the filters within that series as well. The ER9/15/25 are interchangeable. Please contact us for the details.