With the summer outdoor pool season coming up, I thought a short discussion on the use of cyanuric acid (CYA) in swimming pools is in order. CYA is used in outdoor pools to prevent UV light degradation of chlorine and thereby help maintain chlorine levels. CYA is supplied and used as a stand alone chemical and is also a major component of the “stabilized” chlorine products, dichlor and trichlor. While CYA is widely used, its effects on pool water are not widely understood.
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Archives for March 2017
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 will 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, and is used by chemical companies and water treatment companies to predict scale or corrosion and monitor their treatment plans.
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