The unit I got from Buckeye Field Supply has a built in pressure gauge that reads after the sediment filter. I have the entire house on a filter system that goes like this 5-micron sediment filter, 2-micron carbon block, big Kenmore water softener and then on to the RO
. The water pressure varies from around 32-34 psi until the well pump cuts on and then it shoots up to about 52 psi. I would like to do something to keep the pressure on the unit to around 50 psi stable. The pressure you have the pump set at seems pretty standard for a well as far as I know. I have thought of adjusting the sets on the pressure switch at the tank but I need to check with my plumber first to see if it will cause a problem with the pipes.
Just a thought...have you checked to be sure the membrane is seated correctly in the housing? If the o-ring is rolled some it would cause some waste water to go through. Also it may depend on the kind of membrane you have. My unit has the Filmtec 75 gpd. I chose it over the 100 gpd because it is suppose to be about 98% efficient. With 420 ppm
going in and 19 ppm
going out, thats about 95.5%. I could probably get to 98% with higher stable water pressure. Yours is only around 75%, I would say something is wrong with the membrane.