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@stuartv the homefill is a 3-stage compressor similar to a Rix Microboost but a lot less "industrial". It is fed by an oxygen concentrator that uses zeolites to remove the nitrogen from the atmosphere. Since it is only removing the nitrogen, the oxygen is concentrated along with everything else that is in the atmosphere which is mostly argon. You end up with somewhere around 95% O2 and 5% argon. Since the argon is not concentrated in your other breathing gas, you can consider the gas 100% when using it for deco. It's the only way nitrox is generated in many parts of the world, and this technology is used for a lot of military operations in remote locations.
I second @rddvet 's comment about grabbing a couple big bank bottles and prioritizing a booster over a compressor. If you get a 2-stage booster like an AGT-15/30 it has a minimum inlet pressure of 50psi. You could get a diaphragm compressor like the California Air Tools for a couple hundred bucks and put a dryer on the end of it and you'll get breathing grade gas, then put a filter on the outlet of the booster and get breathing gas out of it. I know rddvet is using a Masterline but I think they don't like less than 1000psi inlet gas or you could do it with one of those. If you do it with a MAsterline it is critical you have a VFD though because you need to slow it down to match the outlet of the low pressure compressor.
I second @rddvet 's comment about grabbing a couple big bank bottles and prioritizing a booster over a compressor. If you get a 2-stage booster like an AGT-15/30 it has a minimum inlet pressure of 50psi. You could get a diaphragm compressor like the California Air Tools for a couple hundred bucks and put a dryer on the end of it and you'll get breathing grade gas, then put a filter on the outlet of the booster and get breathing gas out of it. I know rddvet is using a Masterline but I think they don't like less than 1000psi inlet gas or you could do it with one of those. If you do it with a MAsterline it is critical you have a VFD though because you need to slow it down to match the outlet of the low pressure compressor.