Woknblues, I really appreciate your thoughts on this. Im gonna use the Notty. I have it and I have a big blowoff hose for my primary. Based on what youve said here, I wont write off S-04. If I come across a recipe that calls for it, Ill use it. Now, if u do get a pkg of S-05, after you brew, maybe consider washing it? That way you can keep some on hand and dint have to worry bout grabbin some. You'll already have it!