Questions and Answers for Genesis 80 Cubic Foot Aluminum Tank:
Whats the difference between a steel tank and an aluminum tank
Darrick (Certified Scuba Instructor at Scuba.com)
Hello Liam, steel are usually rated at either 3442 psi high pressure and will be a heavier tank so you can take weight off yourself because of the tank weight. Where as the aluminum tanks are rated to 3000 psi and are going to be a lighter tank.
Aluminum Tanks Aluminum tanks are cost efficient, long lasting, and readily available, which is why they are easily the most common scuba diving tanks in the world. Lighter than steel tanks, aluminum dive tanks are easier to transport and swim with, giving your shoulders and arms a break on long treks.
Because of their light weight, some aluminum tanks will begin to float at the end of a dive, once the oxygen supply is nearly depleted. To combat this, it's common to counter-weight an aluminum dive tank with approximately 4 pounds. However, 'Compact Neutral' aluminum tanks are made with thicker walls, which increase the weight and help to counteract the positive buoyancy problems at the end of a long dive.