Direct drives have always worked well off a buffer tank I know a lot of people running 4gpm machines like this. The ones that can’t get them to run don’t understand the fundamentals of pulling water and gravity feeding water and set them up like they would a geardrive/belt drive. I’ll give you a hint, there’s a difference in pressure and velocity of water between a fitting coming out the side of a IBC tote and a fitting coming off underneath a slightly raised buffer tank to clear your plumbing with water in it being equal, It’s all to do with where the weight of the water is, underneath obviously taking all the weight, that’s where the pressure and volume comes from to feed them much like how a spicket feeds a direct drive with positive pressure. It’s not rocket science, it’s pressure washing.
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