Filters down to .027 micron with a 99.99% efficiency. Use it anywhere you need to keep something sanitary. Both 1/4in and 3/8in tubing will attach and it will snugly fit in any standard stopper as well. With an oxygenation or aeration sytem, it will filter contaminants out of oxygen or air. It is connected inline between pump or O2 tank and stainless steel diffusion stone.
Storage: Store in zip top bag in a dry place with minimal moisture exposure. Can last up to 1 year. Discard if there are any signs of discoloration.
About the inline filters: There are two sides to the filter - an "in" and an "out". There is an arrow on the edge of the filter housing that indicates the direction of the air flow. The filter should never get wet, so don't try and sanitize it by dunking it in sanitizer.