A friend recently gave me a pressurized water tank of some sort that has similar anatomy to a corny keg. I've got it fitted for gas in and liquid out, but there's an extra threaded hole that's currently occupied by a pressure release cap (at least that's what I think it is, I don't know what it's actually called). Should mention that it has a proper pressure relief valve so that's not an issue.
So my plan is to take off the cap and mount a gas in with a carbonation stone there. Is was working on a system that would allow me to pull it out after carbonating, but that went out the door when I realized the stone itself won't fit through the hole. So plan B is to semi-permanently (it'll be on threads so I can remove it for cleaning) mount it and just leave it in the keg for the life of the batch.
So my question is, would leaving a stone in the beer for several weeks either gum up the stone, or possibly cause it to break down in the beer?