The rinse pump is ONLY for pressurizing the inductor. Stacks are NOT to be pressurized due to overspeeding gear meters.

Pump specifications: 25 gallons/min at 25 PSI. 

Electric: Typically a 1.5 HP pump will be sufficient

Gas: Typically a 2 inch pump is used and idled back. Typically a 2 inch pump is the cheapest because of availability.