How to use foam inhibitor to avoid 'boil over' or a 'krausen explosion'

pot boil over prevention

Beware the krausen! A watched pot never boils right? 


This rule doesn't apply on brewing day.

Even though you are paying keen attention to your boil, it takes but a second for a boil over to happen, making a mess and causing you to lose wort.

But what if there was a way to stop boil over?


Some pundits recommend that you add marbles or ball bearings to the brew to help boil over.

Or use a spray bottle of cold water whenever the foamy beast raises its head.

But if you want to make sure you don't suffer a boil-over, try using a foam inhibitor!

Foam inhibitor or 'defoamer' is a handy trick to keep your beer from boiling over.

A popular product is 'Fermcap-S'. A fancy way to describe it is that it is a "silicone based food-grade emulsion".

There are two main ways to use it - during the boil and during fermentation.

If you choose to use 'Fermcap-S' to prevent boil overs on the hot side, add 2 drops per gallon for a nice rolling boil.

If you wish to use it in your carboy or fermenter to prevent the krausen from escaping the fermenter, then the dosage is only 2 drops at the start of fermentation. If you didn't know, the krausen describes the foamy head that develops on top of fermenting beer.

If you have added your inhibitor during the boil, there is no need to add any to the fermenter as it will carry over.

When used in the fermenter, 'Fermcap-S' increases the bitterness of your beer (retained IBUs) by about 10 percent.

This sounds dandy but why should I use a foam inhibitor?


Boil-overs are more likely to be a problem if you are using a smaller pot. Users of fermcap have reported being able to make a 5.5 gallon batch in a 7 gallon pot.

While mess is annoying, the real reason you want to prevent this is that the foaming can cause any top-fermenting yeast to be expelled from the fermenter before it can do its job in the wort. 

This then requires the rest of the yeast to work harder to achieve the final terminal gravity which will not necessarily occur if yeast lost has been significant.

There is also another sweet effect of using an inhibitor like Fermcap it actually can help retain the IBUS from the hops - that is to say, it can help your beer become even more bitter when the product is added to the primary fermenter.

Beer is supposed to be foamy! This seems an odd product to use?


Using anti foam may seem to be a counter-intuitive idea. It would seem fair to consider that putting something in wort or fermenting beer to control foam will also kill the head on the finished product.

However, when anti-foams are used properly, quite the opposite is true!

Using vegetable based defoamer


Instead of silicone based products, you can also try vegetable oil versions.

Vegetable oil is a known yeast nutrient and will be consumed by the yeast during fermentation of beer before bottling or kegging.

Commercial breweries use it


Big commercial breweries often use defoamers and anti-foamers as part of their beer processing but given that it's not really within the spirit of purity brewing, it appears not many commercial operations will freely admit to adding silicone based products to their beer!

So what are you waiting for? Here's the cheapest Fermcap I have found on Amazon!

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