re: Vacuum Sealer

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Or maybe there is just a technique to working with those kinds of contents that I don't know about.

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There are a few methods. One is to place the fish/shrimp in the freezer to lightly freeze them. This reduces the amount of water that the sealer has to pull. Another method I use frequently is to fold a paper towel and place between the contents and the bag opening. It slows the water enough for the sealer to pull a vacuum and seal.