When the great pyramids were being built there was still woolly mammoths walking the earth.

  • SirEDCaLot@lemmy.today
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    17 小时前

    Everyone knows you jump in the pool in summer, smell the chlorine, and know the water is clean, right?

    Fun fact- chlorine dissolved in pool water at the usual sanitation levels has almost no perceptible smell or taste.
    HOWEVER, when chlorine binds with certain organic substances, especially ammonia (from the urea in sweat and urine), the result is chloramine which has a significant chlorine-y smell. Chloramine has essentially no disinfecting properties.

    So when you go to the public pool and get a whiff of chlorine and think ‘man they’re using a lot of chlorine today’, no, it probably means someone peed in the pool.

    You’re welcome :)

    • Professorozone@lemmy.world
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      16 小时前

      Ok, but why then when you open a bottle of bleach or container of chlorine pellets, does it smell like chlorine. Do they add the piss ahead of time?

      • adarza@lemmy.ca
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        12 小时前

        take all but 1.5mL out of that gallon jug of household bleach, then fill it back up with water. that’s roughly the concentration of chlorine in a swimming pool.

      • SirEDCaLot@lemmy.today
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        14 小时前

        That’s pure chlorine, much higher concentration. At the concentrations of pool chlorination there’s essentially no smell.

        • Professorozone@lemmy.world
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          6 小时前

          But couldn’t they just be over-coordinating. That’s what it feels like.

          Either way, I’m glad they came up with salt water systems. Much nicer.