Can't say for sure, but the water you filled the system with will always have some disolved oxygen gas in it. After awhile, that reacts with whatever it can and the system goes into equilibrium. So, once all of that gets reacted, it should be stable. If it leaked and you had to add water, or you got air injected into the system from say a pump seal, then it would continue. That's the reason for the oxygen barrier, so no new air can get into the system. See what the pros have to say.