Was thinking O2, but after doing some research, they say don't build an O2 booster for risk of explosions. So, was thinking that Argon and Helium would be the gasses boosted. I was thinking of running it with a lp compressor. (would that be best?) As far as O2 goes I can partial pressure my deco bottles for awhile ountil the pressure equalizes then swap it to the continous flow blend bottle. That won't work the best considering an 80% mix will kill a bottle in no time, but for now the cost of a Haskel is not in the budget. our compressor set us back a few $$$. Today we set up two 6k tanks as a bank and are getting two more too set up a cascading system. we are building a blending stick too continous blend as per the oxy hacker handbook. We (my dive buddy and I) are on a limited budget right now and were hopping too cut a few costs while keeping the compressor where it sets and moving it via air/O2 mail if you know what I mean. Not that it would go far considering the weight of it!!! I'll get more pic's of the fill station and setup as it all comes together.