You can leave your blowoff tube on until you transfer to secondary (if doing so) or you can replace with an airlock when bubbling has subsided greatly. It's your call.
As for blowoff tube on secondary, not necessary unless you plan on adding fruit or other sugars that yeast love to feast on.
Brew2 said:I have my tube in milk jug with water. Will you see it bubble in the jug?
Enter your email address to join: