Water TDS Calculator (When To Change Your RO Membrane ...
In a nutshell, TDS should be under 500 mg/L. Using a Reverse Osmosis system should get you WAY below this. When I first installed my own under-sink RO system, my raw TDS was over 600! After the RO installation, I was seeing a reading of 32. Hopefully, your incoming water is of better quality than mine, and your RO system will perform even better.
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