This is the system we use for wort aeration in the store. The included air-pump pushes air through an inline sanitary filter which is then dispersed into the wort through our two micron threaded stainless steel diffusion stone. Because the atmosphere is only about 20% oxygen, the diffusion stone should be left running in the wort for approximately 30–120 minutes (however even 5 minutes of aeration is better than shaking the carboy.) Monitor the fermenter periodically for possible over foaming. While you are brewing, this system can also be used to pre-fill fermenters with sanitary air.
About the inline filters: There are two sides to the filter - an "in" and an "out". The direction you use doesn't matter, however, you want to take note of which way you first push air through it and always keep it that way. There is an arrow on the edge of the filter housing that we use to keep the air flow going one direction when using it. The filter should never get wet, so don't try and sanitize it by dunking it in sanitizer. If you want to clean the outside of it, use Alpet D2 (CL60). To store the filter, use a little tinfoil on the "Out" of the filter and store in a zip-lock bag.
