Moss Briefs: LSI and ProMoss TM Does LSI Predict Scaling or Corrosion in ProMoss Treated Water Systems? Common questions: • Does ProMossTM affect the LSI? • Should I be concerned if the LSI becomes positive or negative while on ProMossTM? • Are there any examples of LSI being predictive of scale formation on ProMossTM? What is the Langlier Saturation Index (LSI)? The LSI is a simple calculation developed by a boiler engineer to try and predict whether calcium will form scale or water with become corrosive. It is based on the false assumption that all scale formation is due only to saturation and that the water is in direct contact with the metallic surface. It is easy to use, simple to calculate, is used by chemical companies and water treatment companies to pre

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