Ok, to answer my own question:
Freestyle Jet Pumps Recover
Frac Fluid Five Times Faster,
Saving up to $200,000 per Well
http://www.weatherford.com/weatherford/groups/web/documents/weatherfordcorp/WFT053154.pdf
Not sure what HAL do, but I suspect it's unlikely to be free flowed.
Ok, to answer my own question:Freestyle Jet Pumps RecoverFrac...
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