Hard water is a common problem in the average household. Our Hard Water Test Strips (25 tests) can help you find out how hard your water is; they are easily used and thrown away. Simple to use yet so very important in the fight to protect any ionizer investment. Once you have the test results, our water experts here at IonWays will be more than happy to help you pick the best pre-treatment for your hard (or soft) water in order to keep your ionizer working flawlessly for many years to come. Test your water today! Available in U.S. and Canada (0 BV).