junior: I was waiting for something like that to happen!!! That's a good way to shoot a stone thru a carboy's side. Probably, you turned the gas on too quickly: Before the gas is turned on, the wort will(maybe) slowly fill the tube up to the level of the surface of the wort. Now, you try to force a couple of ounces of liquid, with a viscoscity a few THOUSAND times that of a gas, thru a 2 micron stone. Hmmm, I think the rest of society calls those bullets. Please, aim them east, to the ocean!