After coming back from a recent trip with 100 bar of 21/35 (about 1500psi in old money) and having no top-up facility at the local LDS, I thought about diving a bottom stage.
The Pros:
Obviously cost, A fill of one Ali 80 as opposed to gassing twin 12s.
Min Gas is preserved if I descend on the twinset and switch to the bottom stage at depth. Anything goes wrong with the stage then I can ascend freely.
Cons:
Extra Stage to carry
Possible (very unlikely) gas switch to the deco 50 instead, but diving in a team. Also using bottom stages.
For the record the dive is 44m and runtime less than one hour (boat rules)
Have I missed anything?
The Pros:
Obviously cost, A fill of one Ali 80 as opposed to gassing twin 12s.
Min Gas is preserved if I descend on the twinset and switch to the bottom stage at depth. Anything goes wrong with the stage then I can ascend freely.
Cons:
Extra Stage to carry
Possible (very unlikely) gas switch to the deco 50 instead, but diving in a team. Also using bottom stages.
For the record the dive is 44m and runtime less than one hour (boat rules)
Have I missed anything?