stay away from a coffee filter. mix ur solution, heat and filter through through a whatman filter into a STERILE vial, depending on how much your going to be filtering youy shouldnt have too much of a problem filtering as in terms to pressure needed. Think of it as a workout for your thumbs. lol. If for some reason you cant manage this(pansy boy) or your filtering large amounts look into a calking gun with a o washer.