As for filtering,same thing,alot of people use different techniques,i use a piece of cheese cloth for the first strain to get the bigger stuff removed,then i take a large syringe,pull the plunger out and stuff some cotton into the bottom.Fill the syringe with liquid,put the plunger back in and push the liquid through the cotton.I get some gunking on my coils using this method,but it's not as bad as some others have gotten on theirs.
Have you ever tried a coffee filter for the second pass?