I bought these to test if my kitchen sink is connected to soft or hard water. With the help of these strips, I found out very quickly that hot water from the sink is soft and cold water is hard. It would be difficult to understand and get it right, but I decided to look at the instructions to see how difficult it would be. It turned out to be very simple. Colors made it easy to identify the levels for each of the 16 tests. It also made it clear that our tap water was free of lead and other contaminants, which was reassuring. I highly recommend these strips.
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