When to top up and how far???

[slopenutz]

When is minimizing the O2 levels important and how far should I top up?

 

[Wade E]

You need to be about 2" below the bung when it is done fermenting. Best to degas your wine before topping up to allow room for doing so.

 

[grapeman]

If you don't have a wine thief yet, you might want to get one. After you top up, whenever you need to do something with the wine take a bit out with the sanitized thief, perform the action, like stirring/degassing and then you can put the wine back to top up again.