I believe the tank has a life time on it. I am not sure how long it is good for before it cannot be filled. The gauge setup with bubble counter you can buy new for 100 - 120. for both. I have seen new tanks for about 60.00.As of right now it's 121.00 with 1 1/2 days to go. Just be careful not to spend too much on used items. You would still need a reactor.