OP
ACR
Contributor
Agreed. As with many other things when it comes to diving once you understand the why the what is usually pretty obvious 
How to choose a tank
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FredT
Guest
The other point is that an aluminum tank when empty tries to float you head down or to describe it more properly arse up. Most new divers are overweighted to compensate for this. If diving aluminum and can easily do your "safety" stop head up you have way too much air in your BC, and way too much lead around your waist.
Steelies are relativly neutral trim wise.
Your BC will work best if at the end of the dive it's empty. It's preferable to have it empty earlier too if diving warmish water. It never ceases to maze me how may new divers carry around a couple gallons of air in the bag all the time, then have problems with buoyancy control and trim.
Steelies are relativly neutral trim wise.
Your BC will work best if at the end of the dive it's empty. It's preferable to have it empty earlier too if diving warmish water. It never ceases to maze me how may new divers carry around a couple gallons of air in the bag all the time, then have problems with buoyancy control and trim.
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