Hi Folks, Came across this at a home brewing supply site. Its an in-line air filter for 1/4,3/8" tubing that filters down to .023 microns with 99.99% efficiency. It costs $4.95 and also comes in an autoclavable version for $12.50. Go to www.morebeer.com then to the products catalog and click on (beer water filter) and scroll down to [FIL 90: Sanitary Filter] which is what they call it. I have one of these filters but purchased it for another project. I'm not a bubbler but maybe I'll give it a try. Theodore
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