An inline sanitary filter that filters down to .023 micron with a 99.99% efficiency. Use it anywhere you need to keep something sanitary. Both 1/4" and 3/8" tubing will attach and it will snugly fit in any standard stopper as well. Check out this list of suggested uses: Airlock: The most common use might be as an airlock on any kind of fermenter. Unlike other small sanitary filters, this unit fits perfectly into a stopper. Works great for conical fermenters, where displacement air is taken in when samples are taken or trub is dumped. Using the sanitary filter as airlock also eliminates the concern of drawing air back in as hot liquid cools and contracts in a fermenter. Not appropriate for long term storage of beer or wine as it is not an oxygen barrier. Inline Aeration/Oxygenation Filter: With an oxygenation or aeration system, such as an aquarium pump, it will filter contaminants out of oxygen or air. It is connected inline between pump/O2 tank and s/s diffusion stone. Storage: Store in Ziplock bag in a dry place with minimal moisture exposure. Can last up to 1 year. Discard if their are any signs of discoloration.