Aluminum or steel? Most recreational divers use the cheaper aluminum scuba tank. These are the tanks that dive shops sell and rent to recreational divers. They are easy to maintain, though they may dent more easily than steel.

Steel scuba tanks are more expensive and more rugged. Steel tanks can last for many years -- some say as long as the life of the diver. But steel tanks eventually rust and require a lot of care. Steel tanks, which are negatively buoyant, are most often worn by technical divers.

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