Since I have had the same problem recently I will direct you to where this issue is directly answered, on FB. Look at the group 'Concentrated lampworking for adults'. End result for me was to change oxy system, still working with concentrators, but replacing homefill with an air compressor. Not an expensive switch, depending on how many concentrators you already have.
Another group on FB which deals with this issue...'Concentrated Lampworkers'.
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Be Creative!
"All true artists, whether they know it or not, create from a place of no-mind, from inner stillness."
Eckhart Tolle
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