As stated above, use tanked on the outer and a concentrator or two on the inner with a foot peddle. Keep in mind, that tanked will have a higher percent purity. A concentrator will vary depending on the LPM setting. Output purity is in the range of 90% to 95% purity depending on concentrator. Many machines are 5 PSI with some at 10 PSI output pressure if output pressure is of concern.
There are home fill systems that use concentrators to fill a "K" tank. However, the purity will be the same as a concentrator. Some fill to 1500 PSI. Figure a few days to fill a tank.
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