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1. Need to be more concerned with pollutants

With regard to drinking water, the more important consideration is pollutants in the drinking water.

Reducing TDS is fine if you have hard water from a well, but whether your water comes from a well or through a municipal water supply system, you need to be more concerned with organic and inorganic pollutants like arsenic, chromium, iron, fecal  and bacterial matter and so on. It's the safety of the water which should be of primary concern.

In my town, the water supplied by the water board is unsafe to drink because of various pollutants, either not being removed during treatment (if at all the water is treated) and/or being polluted along the way due to defective/broken pipes in the supply line. I boiled off 80% of a sample of water, and was left with something that looked very much like dark urine, so I installed a multi-stage purifier including R/O, although my TDS was only about 200ppm (it is now about 40ppm, and tastes the same as leading bottled water). Now the water passes my boil test too.

The WHO white paper on drinking-water quality can be found here:

http://www.who.int/water_sanitation_health/dwq/chemicals/tds.pdf

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