Two new studies document rare cases in which people who rinsed sinuses with unsterilized tap got infected with brain-eating amoebas.
  • El Barto
    2•1 year ago

    Thanks! I knew what PPM was, but I was having trouble visualizing how much chlorine was that in, say, a liter of water.

    And there you go. 1 mg per liter does the trick, and it’s standard!