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About Paintball Air Tanks
In order to fire a paintball gun you obviously need some form of propellant. Co2, or carbon dioxide, has been the propellant of choice since the beginning of paintball. Today, however, high pressure air is the better choice.
Before the technology was inexpensively available to make high pressure air tanks, co2 dominated the scene. Now, for a new player or for somebody who rarely plays, co2 is a good option. The tanks are very inexpensive and its easy to find places to fill them. Because of their sub-zero tempuratures, co2 is restricted to mostly mechanical markers save for some high end Tippmann Markers. If you were to use co2 in something like a Planet Eclipse Ego, you would instantly notice issues and possibly break your marker.
High pressure air is today's primary source of paintball propellant. Tanks range in pressure from 3,000 to 4,500 psi and range in size from around 13 cubic inches all the way up to around 90 cubic inches. So you have plenty of tanks to choose from in order to suit your needs. HPA tanks are safer, cleaner, and in many cases, adjustable in output pressure. The only downside is the up-front cost of the system, with many 4,500 psi tanks approaching 8 times the average cost of a 20 ounce co2 tank. If you play regularly though, high pressure air is more than worth the investment.