how to fold fluted filter paper so first step you're going to take the right size filter paper for your funnel and fold it in half make sure it says even as you can get it and then the next step is to fold it in half again so making the circle into quarters making sure your edges line up so once you've done that you have to open your filter paper up again and fold the corners along the sides into the middle line and do that on both sides next you're going to open it up after it looks like that and then and then you have to flip it over so it makes the folding of the next part easier so next you're going to take the corner of the end piece and bring it in to the next line creating a half of that section and then you're just going to repeat this process in an accordion style to fold the rest of the paper just as so okay and once you fold it you open it up and now you have your fluted filter paper or your funnel to increase surface area