Yes, that is a fixed flow restrictor and everyones conditions are different. Get a capillary tube and trim it according to your exact conditions, your membrane will last longer, produce more water and produce better water. Most restrictors waste too much which reduces the pressure available to the membrane reducing both efficiency and GPD. You water bill and cost per gallon of treated water will go down too.
just an update to this thread. i installed a dual inline tds meter and recalibrated it to 10% below the 342 ppm stock solution as directed by the manufacturer. my original tds from the tap was 340ppm. this was taken on a handheld tds meter of unknown calibration when i started this thread. dial ahead till now and the tds post water softener is 160 ppm and is 0 ppm after the rodi. i believe this whole time i was getting incorrect readings from a poorly calibrated meter. buy your own test equipment kids!
I would not trust the dual inline since it is not temperature compensated so can be substantially off if the air temperature and water temperature are not EXACTLY the same, which is rare. A good ATC handheld is much more accurate and dependable. I have two dual inlines and don't even turn them on anymore since they never agree with my AP-1 or COM-100.
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