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Hehe.. No, think AquaLung is American - Based in Vista, CA - It used to be known as US Divers. But it is owned by a French company called Air Liquide...CODMAN:I think Gomi that the problem you are foreseing is due to the poor choice of words in the description you cited... "Go up... Go down..." What it really is, and should have been describe properly in the first place, is push up/ add air, push down/remove air... I agree with you that the adding/removing of air with this lever should not be used as an elevator, as the poor choice of words suggest. But rather as a way of establishing neutral buoyancy. In this regards, it is very similar to the Mares Airtrim system, which has proven it's worth (for some like me). So really, there is nothing wrong with the system, just with their description of it which could be a bit misleading to beginners!
Isn't Aqualung European? If so, it could simply be a poor translation to english...
Anyways, just my 0.02$