I think we might be missing a few details.
When you put the pressure gauge on the waste line you read 60psi? Is that before or after the flow restrictor.
You should test the TDS of the fresh water, not the salt water.
Check what the TDS is coming out of your tap (use a very clean container).
Compare that to what comes out of the RO unit before the DI and also after the DI.
So you should have 3 TDs readings.
RO/DI doesn't just remove phosphates but other bad things in the water. Put it this way. If you had a glass of water and mixed sand in it, waited until the sand settled in the glass, then took a straw and drunk the crud on the bottom, that is your waste water.
That is why it is called waste water. It is all of the bad stuff you want removed (not just phosphates).
What water have you been using before? Just use that
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