FACT ONE:
All water is PURE! it is the Total Dissolved Solids (TDS) that is not. All water evaporates without streaks or spots .. it is the TDS (what is dissolved in the water) that forms the Streaks or Spots! TDS is measured in ‘parts per million molecules’. So .. the lower the TDS, the less the Streak or Spot! But ‘Spot-Free’ does not require TDS‘000’ ! The human eye cannot see a spot left from a TDS of lower than 60 parts per million - that is TDS 60.
FACT TWO:
Water dries in circles ... all water evaporates and dries from the outside to the center. As it dries, some of the TDS stays where it was, but most of it gravitates to the center. Then, as the water dries, the dissolved mineral has no option but to remain on the glass - no different to leaving coffee in the bottom of your coffee cup, and coming back 2 days later - all the water is gone, and the coffee solids remain! Make sense??
FACT THREE:
Every town and every City has different TDS levels. If you are curious there are sites on the internet that give you a reading from somewhere in your town. But even then TDS can vary from one side of town to the other. Lots of people have water softeners installed in their homes down here in Arizona for water they use to drink and shower with because we have very hard water down here. I would look into getting one if you don't already.
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