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Basically the name, I'm setting up my skid for residential cleaning and my options for a pump are an 8GPM 3500PSI General, or a 10GPM 3000PSI General. If you had the choice to work with one or the other, which would you prefer and why? Will I be able to get a deep enough clean with the higher volume? What PSI will damage concrete?
 

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The 10 gpm pump unless you have something that requires 3500 psi to clean.

Use this formula:
Impact Force (lbs.) = .0526 x GPM x √PSI

As you can see, the impact force is directly proportional to the flow rate but only proportional to the square root of the pressure.

The "cleaning units" method is marketing nonsense designed to sell cheaper pressure washers at the box stores.
 
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