A tad too technical for me I’m afraid Steve, but I did just recently purchase, from RO man, their booster pump that they build up themselves and it has succeeded in cranking my water pressure up from 30 to 105 psi which has resulted in the supply waters tds reading, after the RO, being reduced from about 300 ppm down to just 1 ppm.
Oh look! There it is in the picture.
Nick