Welcome to the forums.
I did change my setup after the responses back in July. My setup is as follows:
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3/4" supply line from the house runs through a sediment and separate charcoal filter ending in a 200 gallon buffer tank.
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A 3/4" vinyl hose runs from a tap to a 7gpm 12v on-demand pump which then pushes the water through a second charcoal filter, the RO filter, and the DI resin before continuing in a 3/4" hose to a T on the opposite side of my trailer where the in-line TDS meter is mounted.
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The water then runs into a reel with 100’ of 3/8" hose which is then connected via a hose barb to the 100’ (5/16") Xero pure line that attaches directly to the brush head after running through the pole.
I have been getting decent pressure with using both the rinse bar and 2 pencil jets.