After the Di cartride you should be getting 0ppm. The di should take everything out that the RO unit didn't. If your taking the reading after the "final taste"cartridge it may put more TDS's back into the water OR your TDS meter may need to be adjusted/recalibrated.
There is a screw on the back to do that.
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No matter what the morrow brings, inventors keep inventing things.
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Jonathan
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www.cakerybakery.ca
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