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The Clearwave Electronic Water Softener System is an electromagnetic water softener that’s cheap, easy to install, and low maintenance. It works by bombarding your water supply with electromagnetic pulses, increasing the attraction of the water to mineral salts. According to the system’s manufacturer, this results in minerals staying dissolved in the water rather than attaching to pipes.
Installation is simple enough that most anyone should be able to handle it. It merely involves wrapping wires around your pipes.
This seems to be one of the more popular saltless water softeners, possibly due to its low price and wide availability. The Clearwave system sells for less than $150 and is available at brick-and-mortar stores as well as online retailers like Amazon.com.