I have found Dryer Sheets to make a great filter medium. They are made to use as a fabric softener in the clothes dryer. I use them after they have been used in the dryer. Cost = FREE and they have a pleasent smell..
I went to walmart and got a filter for air conditioners that is electrostatically charged. It attracts dust particles like a magnet. It only cost me $3.99. You can cut it up to make several filters - probably last 6 months. That's pretty good for $3.99
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