Update: my question has been answered below by several veryears helpful members.
I just checked the TDS of sevreal zip codes in my area and they are all above 200, bummer
Totally new to window cleaning. Looking at these pure water packages and I see that some are for soft water and some for hard water. I live in a metro area that has several cities with several different water services. How do I find out if these different cities have hard or soft water?