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For reference my new RO system (200gpd from Vyair, on offer at the moment) takes 270ppm tap water to 5-6ppm with the DI being needed to finish it off down to 0ppm.
TDS (total dissolved solids) is basically a measure of how hard or soft your water is which lets you know what ro/di system you will need to set-up. TDS meters can be bought off ebay for under a tenner. Hope that helps
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