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?
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