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Why is that? If you balance your rig you will be able to swim it up at any point in the dive. When I use doubles I have a V-weight between the tanks. AL8os will be buoyant at the surface.OK so a question about aluminum tanks...
If I dive AL80s I will need to wear ditchable weight.
I've had the exact same experience. I pee like a racehorse constantly in a wetsuit. I had a pee valve installed in my drysuit but after the first couple dives I stopped bothering with connecting it up. I just don't feel the need to go when diving dry.This is purely anecdotal, of course, but while I really get the urge after some 45-ish minutes if I'm diving wet, I usually have no problems holding it for an hour's dive in a drysuit. At least if I make sure to take a leak shortly before zipping up and don't overdo that hydration thing. I believe it's because I'm warmer in a drysuit, so there's less immersion diureses happening. I have the same issue about having to go after some 45-ish minutes wearing swimming trunks in the pool, BTW.