Dive Tank, aluminium tank, scuba tank, steel tank

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Steel or Aluminium?

Steel tanks are smaller for there internal volume compared to aluminium and they do not get as buoyant as an aluminium when below 100 bar, so you do not need as much weight. But they are at risk of rust if they get scratched.

Alumiinum are great if they are living on a boat as the are not at risk of rusting. You do neet more weight with them when diving.