I always employ a primary, secondary and cold condition in my brewing process. Yes, even my Porters and Stouts. However, my IPA's, Lagers and Pale Ales are stil a little hazy. I bought this filter thinking that it would remove the haze out of my Christmas Ale. I wanted it clearer than I could get it with my process. The filter made no difference. It still looked muddy. Looks like I need the 1 micron filter. I ordered some and will try that. So, if your brewing process has multiple fermentation stages or a conditioning stage, you probably will NEVER need the 5 micron filter. Go right for the 1 micron!