Interesting. I did not know that.
Yes, I thought it was real interesting when I learned it last summer.
Our water here in North Idaho is very high quality. It’s a blend of lake water (lots of snow melt flowing in) and water from the excellent Rathdrum Prairie aquifer. That aquifer has enormous amount of water flowing through it and it largely flows through a huge pebble-bed filter left behind by all the glaciers in the area 12,000 years ago.