I use them for carbonating water in 2 liter bottles and they work great. I had one that erupted when I opened the bottle quickly after carbonating and was fine when I opened it slowly. It's got to a point where the CO2 in the 2 liter bottle will flash when you loosen the cap. So if you see the bubbles rising quickly, quickly tighten the cap or it will overflow, then slowly loosen it again.
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