rodi weirdness

[scherzo]

As Eugene said, backflushing may help.. and maybe let it run for a couple of hours.

I just checked my TDS out of the tap and I'm at 6 right now. Yes we have pretty good water here out west. It also rains a lot so we get a lot of water.

Your RO membrane should last for a few years out here. I change my DI after about a year or so.

Can you check your ppm after the RO and before the DI?