[Jewelry making - Article 00088] - Re: [Orchid] Utility Sink, Hard or Soft Water?

[Dave Arens]

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Hi John,

>     Thus, I find it difficult to understand how the addition of salt
>     to hard water can possibly soften it.  

    You're right, it doesn't. In the US, most domestic water softners are
    of the ion exchange type. The raw water is passed through a column of
    resin or zeolites. When the capacity of the column to remove the
    'hardening' agent(s) is exhausted, it's regenerated by back flushing
    with a brine solution. In some cases potassium chloride is used
    instead of sodium chloride. Column capacity is usually rated in the
    number of gallons of water that can be treated between regenerations. 

    Most softeners regenerate automaticly & all that's required of the
    homewner is to keep the unit supplied with salt or potassium
    chloride. Most units can hold about 200 lbs of salt. 

    Many Drs & nutritionists reccomend the potasium chloride since
    potassium is in short supply in a lot of diets & sodium is in excess. 

Dave

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