Firstly, having your wife get an Al 63 tank is some of the worst advice I've heard, bordering on criminal
"Criminal" Now that is funny right there.
"Give a child a hammer and everything he encounters requires pounding."
No where in the OP did I note that this beginning couple wants to do more than simple warm water ( ie. no overhead, no decompression) resort diving. Thousands of these dives are done every day with an excellent safety record. His air consumption (sac rate if you prefer) will improve with practice (but so will hers) and will probably always be a controlling factor of dive length. A non-technical diver's buddy obligations DO NOT include carrying extra gas to augment his buddy's supply, so there is no reason for her to lug a larger tank of unnecessary gas. I see absolutely no problem with his renting bigger tanks if he can, or her using 63's if he cannot.
Rock bottom.
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---------- Post added December 6th, 2015 at 10:34 AM ----------
I'm a very new diver and I'm trying to figure out solutions to a few issues I'm encountering.
One issue is I use a lot of air. I think the main reason for this is I'm a bigger guy with a more athletic build. My wife is rather petite and compared to me she uses very little air, so it seems like we'll be limited in our dives to my tank pressure.
My question is this, are AL 100 tanks common in dive shops? I can carry the extra weight without issue, I'm just curious if many shops have them or are they very rare to see in rec diving? The notion of having 20% more air sounds very good to me!
thanks.
Having trouble finding simple, warm water dives in the above.
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