I also wrote a book about water and started out 10 years ago studying the water treatment options. The problem with filtration methods is that it's never a completed proces, if water quality is your aim. Which it is, when it is for (daily) consumption. The answer to your question therefore is too long, but I did write a Blog about your question (In Dutch ;) https://nieuwwaterwinkel.nl/de-waarheid-over-omgekeerde-osmose/

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I also wrote a book about water and started out 10 years ago studying the water treatment options. The problem with filtration methods is that it's never a completed proces, if water quality is your aim. Which it is, when it is for (daily) consumption. The answer to your question therefore is too long, but I did write a Blog about your question (In Dutch ;) https://nieuwwaterwinkel.nl/de-waarheid-over-omgekeerde-osmose/