Because of the unique construction of the ME Series, Perma Pure strongly recommends against using liquid water or alcohols to clean them. Both liquid types have the tendency to swell the Nafion™ tubing , possibly causing the material to deform and kink within the protection braiding during full contact, restricting gas flow and reducing drying performance. In situations where this type of cleaning is deemed necessary, in order to limit the swelling effect, Perma Pure recommends that the cleaning process be done quickly and that clean dry air be used immediately following the cleaning to quickly remove the moisture from the tubing after contact with liquid water or alcohol.