Do you ever have to refill your airlock? I don't remember having to do that in previous batches. But this one just keeps going (it's down to mabye one "burp" every 10 minutes). I've had to add water to my airlock a few times now. And I plan to keep it in this carboy for another 2 weeks. I'm using the S type air lock. Should I just stick to the 3-piece for future batches? Would I have to keep adding water to that one too?