1. Dr. M. Amin on

    PPM is not the only matter you should test. For example, Watson’s Water has very low PPM, sounds very good. But, it is not, bcs the pH is ONLY 6.5, acidic and dangerous. Water with less than 150 PPM TDS and 7.5 to 8.0 pH is a good one.

  2. Good experiment. I was also curious and did the same at-home TDS test with a variety of bottled waters. After doing some online searching and posting my test findings to friends I discovered that a higher TDS reading is not necessarily bad- many natural mineral waters have higher readings than tap water. Evian water is listed on its website as 309 ppm.Fiji water lists itself as 224 ppm and both of these are considered premium brands. Beneficial Minerals such as calcium, magnesium and potassium are present in higher quantities in many mineral waters. TDS solids can come from natural sources as well as manmade sources. I also measured distilled water, which of course was 0ppm. World drinking water guidelines say that TDS readings under 500ppm are desirable for drinking water. I had thought my TDS reader would show impurities like microorganisms or bacteria, which it doesn’t. So when I discovered my TDS readings for my tap water and expensive bottles mineral water were both over 300 I panicked. But it’s safe to drink one and not the other! Anyway, kudos to you for doing this — with vendors reusing and refilling bottles with who knows what it can be nerve wracking. Thanks again!

  3. avatar

    Hi Doc,
    Oh wow, I didn’t realize that! Thank you very much! I’ll look into how to research that. Thanks a lot!

  4. avatar

    Wow you’re right! This is interesting. It’s such a struggle to find the best bottled water for our children, isn’t it? Glad you liked the post though, will see what additional research I can do. Thank you!

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