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  2. Tips for troubleshooting water heater issues - AOL

    www.aol.com/tips-troubleshooting-water-heater...

    Water heating problems are some of the most common plumbing issues. On average, water heater repairs cost $150-$250, depending on what’s wrong.

  3. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    The presence of certain metal ions like calcium and magnesium, principally as bicarbonates, chlorides, and sulfates, in water causes a variety of problems. [1] Hard water leads to the buildup of limescale, which can foul plumbing, and promote galvanic corrosion. [2] In industrial scale water softening plants, the effluent flow from the re ...