O2 cleaning?

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Grade E is a garbage standard. I can get that with my bicycle pump.

Now then-Most compressors can reach the "OCA" standard with normal filtering. I have 2 compressors (Bauer 9cfm-ish) that always meet the OCA standard without extra filters. Those that say that Hyperfiltering is necessary to reach "OCA" is just hypermarketing.
Or they have a crap compressor that needs extra filtering.
 
https://www.shearwater.com/products/peregrine/
http://cavediveflorida.com/Rum_House.htm

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