I have not attended any of the NTM support group meetings in NYC but have gotten the minutes. I will be moving in December and anticipate looking into the following at that time. Another way to acquire the filter which allegedly can block mycobacteria is to contact Chris Connelly Pall Life Sciences National Water Sales Manager at 866-347-3428 (chris.connolly@pall.com). Their website http://www.pall.com If anyone pursues this, please advise the rest of us. One question that I would like answered: if we put the filter on only one shower head that is only used by us, do we need to change monthly or can we change every other month (I believe that is what Katherine did)? Do we need to have a general water filter on all the water as well? Terry