This doesn’t really fit with my understanding of what hard water is and I’m very concerned.
The place I live now has hard water that is way different from what I grew up with, but it just means that I have to use a lot more soap to clean any oils off my skin or hair, and every faucet gets a ton of lime buildup obnoxiously fast.
They gotta blame the people who designed the city. If these kids were a small fraction of the same age and in Japan they would be on TV for braving their first solo trip into the market to buy a vegetable for dinner. It would be a cute TV show called “Old Enough” on Netflix with English subtitles instead of a cruel reality on this side of the same planet where a kid is now dead.
That part of it isn’t the fault of the parents, but the fault of the society we have created.
Btw that TV show is a few decades old but my point is that the world is possible. We don’t need to be like Japan was in that TV show, but we do need more walkable cities.
My understanding of hard water is just that there’s more calcium and magnesium ions than would otherwise be present in softer water. The varying degrees of hardness would just be the varying concentrations of these ions.
The way you experience as a human (as opposed to measuring this with a water probe) is that soap will form a complex with these ions and maybe precipitate out a little soap scum, and this reaction will happen at the same time as the reaction which complexes with any oils or dirt so it’ll effectively be wasting some of your soap and you will have to use more soap.
So you’ll be shampooing your hair and you’ll use the same amount as you used back in the soft water city and you’ll be thinking “I used the same amount of shampoo as I always do so why does my hair still feel oily?”
I have one of those articulated segmented hose things on my shower head so you can pick it up and move it around while it’s spraying and the whole thing gets all covered in limescale super fast because the hard water evaporates and precipates out the magnesium and calcium as calcite or aragonite crystals. I had never seen this happen so fast and it ruins the hose so often that I thought I was dealing with excessively hard water.