Aqua-Rex uses no salt or chemicals, so there are no unfriendly environmental discharges like a traditional water softener. It requires zero maintenance or servicing, and Aqua-Rex uses minimal amounts of energy to run – about $20 per year in most areas. there is no unpleasant taste to the water and Aqua-Rex does not risk any additional corrosion to your plumbing system. Its a lot less expensive to buy, install and maintain.