Just bought a 13 CF Catalina Tank to refill my HPA tanks with for use with paintball guns. It's used and needs Hydro/VIP - how soon should I expect it to esplode? Do I really need to pay some scuba faggot $50 to look at my new tank? That's what I paid for the whole thing... Also did I get ripped off? Picrel.

Furthermore, if it's 13 cubic feet does that mean it's 156 cubic inches? That means I can fill my 48 ci HPA tank with this scuba 3 times before the scuba is depleted, right? How do I know when it's full? Since it's 3000 PSI should I just pump it to 3000 PSI and consider it full? Thanks.