Quote: (Originally Posted by
nic_the_greek)
Secondly, last year we took a twinset of 30/70. By decanting 75bar in to an e,pty twinset and topping with air to 210bar you'd get a 24/25 mix. Not exactly what you're after but it was good for us and is divable to 45m.
This is also a good way of doing it, if you can get enough twinsets, or potentially use stages. We did this in France this year, do a dive with a very rich He mix, then simply air top it for the 2nd dive. The stages were great, breath one empty, equalise with a full one, air top both and you now have enough for two more dives.
Of course this means you may not be diving standard mixes.
cheers,
Paul