Fermcap-S 1 oz.
An anti-foam agent that can be used during fermentation to eliminate messy blowoff. As soon as fermentation is over, this insoluble compound settles out and remains behind when the beer is racked. It will not affect the finished beers flavor, appearance or head retention. Can also be added during the boil to reduce the risk of boilovers. Use a few drops per gallon for boil, or two drops per gallon for fermentation. Comes in a one ounce eyedropper bottle. Keep refrigerated until use.
Used a couple of drops in two liter yeast starter and it worked great. Last time didn't use it and had huge mess when it foamed over.
Great to stop a boil over quickly
Works like a charm for both the boil and fermentation. One of the best upgrades that I've made to my process. You don't need two drops per gallon as suggested. I add 4-5 drops just prior to boil and don't add any more into the fermenter and have had no more boil-overs or issues with krausen coming through the airlock. Best of all, no more sitting over the kettle with a spray bottle.
This is the best defoamer to use in your brew. It doesn’t affect the taste or fermentation.