Edited to respond to no one in particular:
Some of those pollutants in the water tank in an out-of-town property help make country folk "as strong as a mallee bull".
Due to those little bits and pieces, drinking tank water helps build up resistance to some germs - sort of a vaccine?
Just Lift Up the Cistern Lid and look in there - no microscope required or the inside of your electric kitchen kettle.
Batteries in our cars and irons require distilled water not normal tap water.
DEB
