One of my clients has a Vertex Deluxe RO/DI and it was running around 160 ppm iirc. I emailed Vertex about it and they didn't seem to think running that high was good.
We have chloramines here and pushing the water through the unit that fast was allowing chlorine/amine into the RO membrane. Burned through a membrane real quick. Now the booster is unplugged it runs like a champ and the RO membrane is on track.
