Ive never used anything that small, but I believe the problem is going to be a) they are not going to generate much co2, and/or b) they are going to expire too quickly. I'd go with something closer to 1.5-2 liters. Using two is good, and change out one per week. The staggered start times will help maintain a consistent rate.
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Last edited by burr740; 10-29-2014 at 05:36 AM.