 I used to do that years ago. I remember when I was first getting into root beer making. I was so excited about it, and I thought, man, I'm going to do this. We're going to make this happen. And I was disappointed. I tried the dry ice, and that was OK, but it was relatively flat. And I got frustrated with other types of methods. We tried some other types of carbonation methods, and it didn't push the carbonation in like I wanted.