There is something which is puzzling me... In the dim and distant past, before water treatment, often water was unfit/unsafe to drink, so beer was drunk instead. As I understood it, the brewing process made the water fit and safe to drink - or have I got that wrong? As a youth, I remember working on nothing more than a plank (No H&S then), installing equipment directly over the vast open vats of fermenting beer and being concerned about all the dirt, plaster and debris being disturbed falling into the fermenting beer. This in an old brewery - I was told not to worry about it. Now we are very careful about what water we use and making sure all the equipment is sterile before use.