For years I have been using my 3M Airstream while turning and it has worked well. I recently installed my last filter (AS-140-25) and went to order a couple more only to find out they are no longer available! Has anyone found a suitable substitute that we can use? Hate to think that 3M just left us without any options. I do plan on contacting 3M but wanted to reach out here first. Thanks in advance for any suggestions!