Does fermcap prevent blowoffs?

Fermcap-S Foam Inhibitor: Prevent boil overs on the hot side, add a few drops per gallon for a nice rolling boil. On the cold side, Fermcap keeps the krausen in your fermenter to 1/2 an inch. Allows you to brew slightly larger quantities in your existing fermentation vessels. Use only two drops per gallon at the start of fermentation. Used in the fermenter, it increases the bitterness of your beer (retained IBUs) by about 10%! Comes with dropper lid. Enough for about 20 batches.

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