My plumber installed this unit correctly in our water line when we installed our new water heater. I bought a total dissolved solids (tds) meter and checked the tds at intervals a few weeks prior. In Santa Fe, New Mexico, water hardness is in the 150 ppm range where I live. I've consistently gotten readings around 85ppm. Not bad if the meter is accurate. It has been at the waterline since mid-February and the reading of 85ppm remains constant. Our shampoo foams better than before thanks to our old kettle and our skin and hair feel softer. So it appears that this device has done nothing and the addition of a new water heater is to blame for the softer water feel. I gave it 5 stars for ease of installation and 2 overall as I can't say with 100% certainty that it didn't help in some way; although the counter says otherwise.
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