Hi Dave. From what I gather most folks use Oxygen Frog over HVO due to price, politics (BS law suit by HVO against Oxygen Frog), and customer service.
That said either one of their systems are better than oxycons, they produce higher PSI and will fill a K tank faster also.
I usually leave the last 100lbs in the tank to avoid any sediment in the tank getting into my lines. But I use the last of the tank for prep work, stringers,
points, and small pieces for use on larger pieces.
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