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I have two steel 120s, a 13 pony, an AL 100 that just went out of hydro (for sale) and a pair of AL 80s for my daughter.
I am with Storker on tank number. Having 10 tanks means an endless chain of expenses to keep them in service. I feel the same about regulator sets, having extras mean having more gear to worry about and unless.the spare is with you it serves no purpose. My usual dive buddies and I have trouble transporting much beyond three kits and six tanks in a single vehicle.
I think a reasonable way to break down the polling would be to say rec vs tech. These are the most basic division of diving. Rec is max depth 130’, no deco, no overheads. Tech is everything beyond that. You can have every card availablelable and decide you want to dive single tank and no deco, you are a recreational diver.
2x 7L 300bar plastic
(it is composite tanks with stainless steel lainer inside, made by Armotech)
Using it for SM configuration
With 3kg of lead weights it is neutral in the fresh water.
Voted as 1-2.
But I have also some steel tanks 2L 250bar. One for air, just stored at my home as isolated gasmask And three (two from them is spare) for oxygen system. Stored at my home as gasmask or sometimes I take it for diving as first aid kit (universal usage ).
I'd like to see something like this split apart for professionals and recreational divers. I suspect those involved in things like teaching diving (at any level) are likely to have more tanks on hand for students to use and thus skew the results.
But I have also some steel tanks 2L 250bar. One for air, just stored at my home as isolated gasmask(at my home! on the surface! but I can use it underwater, but just as spare air) And three (two from them is spare) for oxygen system. Stored at my home as gasmask or sometimes I take it for diving as first aid kit (universal usage ).
So, either those tanks aren't used underwater, or you're quite happy with ~7-10 minutes bottom time. Or it's a suit tank. That's what a single 2L 250 bar means to me (for twins, extend the bottom time to 15-20 minutes. Still a bit short, even in cold water, to me).