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I think you mean 10/50 O2/He ( actually for the pedants 10/52 or 10.5/50) which I use for all my dives. I can mix it with just air and He (no separate O2 so no bangs or expensive cleaning). Just fill to half the working pressure with He top of with air). Other Heleair mixes are just other proportions.
The problem for OC is that the 10% O2 is not life sustaining at shallow depth. Fortunately the Inspiration I use ensures it is safe and optimised for deco.
Hope this helps.
Alan
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