Thats acceptable for your system. The RO works at about a 98% efficiency.
If you wanted to bring it down to 0, as many do, then u have to add a DI (dionization) cartridge.
Here in Surrey we have about 12-15 ppm water and I run an RO/Di system for 0 TDS.
The lower your ppm, then the less work the DI portion has to do. The DI, expensive stuff, lasts longer.
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