Well unless you have a lot of time then the small boosters ( jetsam baby booster, haskel sport booster etc ) aren't going to do it IMHO ,Some of us are waiting to see reports of this one
New Booster In Town!!! - Rebreather World
the compression ratio is very good & the fact it will boost with only 7 bar drive gas pressure means that hopefully it will be very easy to run from a small oil free compressor .
HTH
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Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards