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 Calculate Water Balance Once you have major the various parameters below, you can use this convenient Langelier saturation index calculator to determine whether your water is corrosive, scale forming or nicely balanced. If it is corrosive it will try to saturate itself by dissolving the structure of your pool. If it is scale forming it will try to correct its over saturation and by precipitating the hard water salts causing cloudy water and eventually deposit scale on pool components. Saturation Index = pH + CF + AF + TF - 12.1 CF is the calcium hardness factor. Optimum range 75 to 150 PPM. AF is the total alkalinity factor. Optimum range 100 to 150 PPM. TF is the temperature in degrees Fahrenheit. pH. Optimum range 7.2 to 7.6 If the result of this calculation is zero then the water is balanced. If the answer is less than zero then the water will tend to be corrosive. If this is greater than zero, then it is said to be scale forming. An acceptable range is -0.5 to +0.5. If the result is outside this range, adjustments should be made to the hardness, alkalinity and pH to bring it as close to zero as possible and ideally within the optimum ranges shown above. Be aware however, that while the water may be balanced from a corrosion and scaling point of view it does not necessarily mean that it is ideal for sanitizer efficiency and bather comfort. If the LSI is Less than -0.3, Treatment is needed - Bring in a Water Sample to one of our stores. A full range of test kits are available from our online shop to enable you to carry out these tests. |