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A good saturation index is falls between .3 and -.3, with a range of .5 to -.5 being acceptable. A negative number indicates corrosive water, which is bad for concrete, metal and plaster surfaces. A positive number may deposit scale or cause cloudy water. Water with a result of zero (0) is neither corrosive nor scale-forming. The index takes into consideration a number of factors: calcium hardness, alkalinity, pH, water temperature, and total disolved solids (TDS). These items are assigned a number and then plugged into a formula. This saturation index was developed by Professor W.F. Langelier from the Univeristy of California.

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Q: What does a langlier index of -3 indicate?
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