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500 PSI Mask Defog is without question the Clearest, Longest Acting and Most Effective Defog on the market. One-Application Works for at least three dives in one day. Cleans your Mask each time you use it. Wet or Dry Application, has the Consistency of Extra-Thick Toothpaste, and when applied to the lens typically lasts all day long. Large 12 fl oz (355 ml) makes it great for Instructors or Dive Masters when students forget to bring their own.