02GF74 said:paraffin - used in greenhouse heaters so any garening place would have it.
coffee filters is too expensive
I paid £2.85 delivered for a hundred, I don't think that could be considered too expensive I experimented with paper (had some kimwipe roll) and it doesn't filter anywhere near as effectively. Also, the coffee filters retain their strength right to the end, even overnight, so when you take them out of the funnel they're still in one piece.
Dave.