What if range chemistry is the wrong thing to focus on when managing water? What if the ranges do not always apply, like in the winter? Theoretically, the textbook ranges for chemistry are ideal. But in reality, that's not always the case. In this article we will explain why we prioritize the Langelier Saturation Index (LSI) first, and range chemistry after that.
langelier saturation index
Way back in 1984 I founded my service and repair company, The Pool Surgeon. I had no idea what ORP and LSI abbreviations meant, let alone their definitions. To be completely honest with you, I am not certain I was any better informed in the first 25 years of my pool career. As ashamed as I am to admit it, I'm admitting it because it's the truth.
The Langelier Saturation Index (LSI) is a cornerstone of the Orenda program. The LSI is the unbiased measurement of water balance, as defined by calcium carbonate saturation. It determines if our water is aggressive/corrosive (low LSI), balanced, or scale-forming (high LSI). It sounds simple enough, but let's dive in and show you just how much it matters to other aspects of water chemistry.
Pool builders, plaster applicators, and service techs know that a pool startup can be a real pain. Plaster dust is just the tip of the iceberg. For residential pools especially, most pools have water filling them within hours of finishing the plaster. That means the tap water and its chemistry is immensely important in the curing process (hydration) of new pool plaster.
Carbonate Scale is a buildup of hardened calcium carbonate (CaCO3) on pool surfaces or equipment. Scale can be a big problem for a pool and its plumbing system (and other water systems besides pools, like fountains). Like most of our articles on the Orenda blog, this article is meant to simplify chemistry so that the chemistry can be better understood . If you want more detailed information, just click the links to our sources to read more.