I'm sorry you did not get a reply to your question (in case you do visit the site again). My reply will at least bump your question to the top of the line again. I'm sorry I do not use a nasal mask. I'm assuming you are referring to the nasal pillow part of the mask. I believe I have read that though with cleaning they do not get contaminated they do lose their shape. I think your DME will allow you two sets a month.
Come on you folks with the Swift FX or similar mask , let's see if it's not too late to help this man.
Just joined and have been using Swift FX about 2 weeks. I like the softness of the nasal pillows. I have read that they get too soft, but I am not sure how long it take for that to happen. They are easy to clean. I do not like that the air tube does not attach to the mask. It pulls down on the nasal pillows.