Hi, I have replaced the filters in this head, but it was a while ago. I also have a spare head in parts. So i could maybe help you out. The problem is I'm not going to be where that equipment is for about 2-3 weeks. Cordially, John Harmon _www.ThisBirds4u.com_ (http://www.ThisBirds4u.com) 336.363.9138 **************Biggest Grammy Award surprises of all time on AOL Music. (http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp003000000025 48)