A little off topic, but hoping for some helpful input... I just filled my keg with 4.5 gal of tap water (softened) and put on 30 psi of c02. I want to put the keg in my chest freezer and can't keep the co2 connected, Anyone have any idea how long I can keep it in the freezer w/o worrying about it freezing? Just trying to help speed up the carbonation process. Basically wanted to have a keg of seltzer water on hand. Thx!