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Originally Posted by Never_Enough
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Out of these, I'd go with the first on, it's got the highest PSI rating, and the highest GPM rating. The GPM or how much water volume it pushes is just as important as the pressure, You need as much water volume as possible to not only wash the dirt off with soap or cleaner, but also rinse everything off afterwards. If they can be believed, the reviews for it at Home Depot and Amazon are pretty good.