Instruct: Classify a review as either positive or negative.
Query: If it pumped CO2 into the bottle it might work.

I bought one to give it the benefit of the doubt. I've used it six times so far and found that it does nothing. If anything, it seemed to make the fizz die faster. This is just my opinion. It didn't work for me. I pumped it enough times and took every precaution to keep the soda out of the device itself. Even pumping until the bottle is very, VERY hard, it still didn't hold fizz for a few days. I am thiking the previous post is correct. Air pressure does not keep CO2 in the liquid. Perhaps if it pumped pure CO2 into the bottle it would work, but it doesn't. I supposed that is why they make smaller bottles. I won't waste money on another one.