The city of Flint, Michigan, has entered the chat.
But in more seriousness there are plenty of mostly harmless impurities in many municipal water systems such as an excess of minerals i.e. “hard water” and water filters can improve the quality of water that is considered clean enough to drink.
What are you talking about?
I get not everyone has clean running water in the world, this sounds backwards.
How do you end up in place where you can multifunction fridges but not clean running water?
Clean running water doesn’t mean that biofilm doesn’t develop where air meets water. Aerators are a breeding ground.
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/aerator
The city of Flint, Michigan, has entered the chat. But in more seriousness there are plenty of mostly harmless impurities in many municipal water systems such as an excess of minerals i.e. “hard water” and water filters can improve the quality of water that is considered clean enough to drink.