Here's why the LSI You're Using is Inaccurate.

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 The Langelier Saturation Index is the basis of swimming pool water chemistry. A simple mathematical formula determines whether the water is in balance (neither corrosive nor scale forming). Realistically, not a measure of the success in preventing algae or bacteria, but a calculation designed specifically for the protection of the vessel, the swimming pool itself—a determination of calcium carbonate saturation. Let's face it; we have come to depend upon the accuracy of the pool industry LSI (Langelier Saturation Index).

The water being in balance is extremely important, and the LSI is a tool we rely upon. After all, we know water needs to have a certain amount of calcium and carbonate in solution, and the level we need varies upon both temperature and pH. If the water is found to be corrosive, it will pull calcium and carbonate from the pool walls and floor, etching the surface. When the water is scale forming, everything from a cloudy water condition to calcium carbonate deposits forming about the pool.

But, is the formula accurate? And, are the apps even necessary?

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