My wife and I recently had a RainSoft representative come to our home. He tested our water and showed us that it was hard, which we already knew. We were using a store bought filter for our drinking water, and he tested that water as well. Turns out that, that water was just as hard. What sold us on purchasing the system was a test where he showed us how many pollutants were in our water, including sewage! Even the filtered water was just as polluted, gross!! Since we have had our rain soft water softener installed our water is smooth as silk. But the drinking water is sparkling clean and delicious, that comes from our reverse osmosis spout. Thank you RainSoft for educating us about our water.