Blow-off Hose vs Airlock: Which, When, and Why?
For primary fermentation, if using 5 gallon carboys, you almost always want to use a blow-off hose. For larger carboys, such as 6 and 6.5 gallon, you can probably get by with using the airlock for most beers. When doing secondary, a blow-off hose shouldn’t be necessary, no matter the fermenter size. Below is a