I have used a Food Saver for almost 20 years (not the same unit, upgraded a couple times). Used to go to Lake Michigan for salmon and still have fillets from 6 years ago that are almost as good as fresh. As mentioned, make sure there is no excess moisture on the fillets. I also double seal the bag. After sealing it once I wipe that seal with a napkin and then seal again 1/4 off the first seal, just to make sure. Never cared for freezing in water as it just takes up room.