Water Quality Association

Water Treatment For Dummies

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25 through a certified water-testing laboratory. You can check with the Water Quality Association (WQA) to find a water quality pro- fessional (www.wqa.org) or connect with a certified water-testing lab to test your water (http://water.epa.gov/scitech/ drinkingwater/labcert/state certification.cfm). Is My Water Hard or Soft? Water hardness refers to the level of certain minerals, particularly calcium and magnesium, found in your tap water. Hard water causes both aesthetic and usage problems, such as spots on dishes or sink fixtures, scale buildup on showers, tubs, sinks, and toilets, and poor soap lathering. It can clog pipes over time, increase the energy for heating water, and damage internal parts of household appliances that use water. The unit for measuring water hardness is grains per gallon, or gpg. Table 3-1 is a simple chart from WQA showing what these numbers mean. Table 3-1 Water Hardness Classification Grains Per Gallon (gpg) Hard or Soft? Less than 1.0 Soft 1-3.5 Slightly Hard 3.5-7.0 Moderately Hard 7.0-10.5 Hard 10.5-above Very Hard These materials are the copyright of John Wiley & Sons, Inc. and any dissemination, distribution, or unauthorized use is strictly prohibited.

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