Quick acting Five Star Defoamer 105 is a 10% silicone food-grade emulsion designed to control foam in kettles and fermenters. All emulsifiers used in Defoamer 105 are nonionic.

Defoamer, also called foam control, is an easy, effective way to reduce boil overs during both the boil and primary fermentation. Just put a few drops in at the beginning of the boil and/or primary fermentation. We've found that using this actually helps with head retention as well!