Different areas have different city water (hard/soft), which should be taken into consideration in this discussion. Obviously the hard water is going to be the worst for both beast & machine. Here in Cincinnati, lurks the worst water around, so I have a filter for the entire house system, which takes out chlorine, lead, minerals, and all the rest of the crud. This filtered water has to be quite benign and completely harmless for engines. (Unfortunately the floride is filtered out as well, so we use a lot of toothpaste - for teeth, not coolant).

__________________

Don't Chrome them; polish them