Lyse” Ah, I was not aware of such a distinction between gray and black. In the town everything just goes to the water treatment plant“
Yes, we have two waters at our new kitchen sink, on is bore water, another fresh rain water and a proposed third tap will be distilled water. Add that to grey water and black water, makes five kinds of water in our house.

@lyse@lyse.isobeef.org Yes but the 6th is missing, a beer pipe! 😁

More seriously, here is an interesting article about water.