plastic food bag,put filter inside it with some oil,squeeze it thru so its evenly coated all the way thru it,remove from bag.
if the filter is too laden with oil it will work too well and stop the airflow also,so give it a gently squeeze with some paper towel around it to get rid of any excess oil,basically if you squeeze the filter between finger and thumb and you see lots of standing oil on the surface of the filter then its too much,a little is ok.
if you do a few at a time you can then keep them in a ziplock plastic bag ready to use as needed.
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