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Abundant Flow Water Systems makes the Scale Sentry Water Conditioner, which is designed to treat water hardness of up to 25 gpg. Like other popular saltless systems, it works through a process called chelation. The system runs your home’s water through filtration media intended to change the structure of hard water ions so that they don’t form scale.
In addition to not using salt, this system also uses no electricity. The company offers a 30-day money back guarantee, a 5-year warranty on the valve, and 10-year warranty on the tank.
You can buy this system at both online and brick-and-mortar stores, Amazon.com, or directly through the company. Keep in mind that you’ll also need to replace the filter media periodically.