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The ideal LSI value is -0.5 to +0.5. Maintaining a slightly scale-forming condition (+0.1 to +0.4) can prevent erosion, corrosion and excessive scale formation.
Like pH, the LSI value is logarithmic, meaning that a difference of 1.0 equates to a difference of ten times in reality. A Saturation Index of -2.0 is ten times more corrosive than an SI of -1.0.
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