@AdamPWC I can confirm perfect results at 40ppm (straight rain water of the mains tap).
I have also had perfect results with 30+ ppm running threw the ro/do system.
I am ocd with perfection and will not accept lesser results (no spotting, no streaks/runs and no bee pollen the glass must be 100% otherwise the ladder comes out) so please don’t think it will give a “near enough” result. The results are perfect).
It actually comes down to which specific minerals are left behind in the water (the white minerals show up the most) not so much down to total mineral content (ppm) which is just an indicator.
I have spoken directly to a manufacture that has a much greater understanding and am no longer worried about a small amount of ppm.
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