OUT Filter Mate Water Softener Cleaner and Salt Booster is a powerful water softener cleaner recommended for city water applications. Over time, a water softener can become fouled and lose its effectiveness due to a buildup of iron, lime, minerals, tannins and other water contaminants. OUT Filter Mate provides continual water softener cleaning and improves salt performance by removing light buildup and other water contaminants. Regular use provides effective water softener maintenance, restoring it to peak efficiency, making your water taste better and extending your softener's life. In addition to cleaning and maintaining your water softener unit, this powerful and versatile formula may also be used to adjust the pH levels in your water or as a general purpose cleaner for your dishwasher, tub, sink, shower, faucet, ceramic tile, dishes, glassware, plastic ware, ice machines, ultra violet filters, humidifiers and distillers.