Below are two methods to solve for the Langelier Saturation Index. Method 1 automatically calculates the various factors (temperature, hardness and alkalinity). For method 2, the user will need to manually look up the values from the table and place the values into the calculator.

Solving for Langelier Saturation Index.

Solving for Langelier Saturation Index.

Water Temperature (°F) |
Temperature Factor (TF) |
CaCO_{3} PPM |
Calcium Hardness (CF) |
Total Alkalinity PPM CaCO_{3} |
Alkalinity Factor (AF) |

32 |
0.0 |
5 |
0.3 |
2 |
0.7 |

37 |
0.1 |
25 |
1.0 |
25 |
1.4 |

46 |
0.2 |
50 |
1.3 |
50 |
1.7 |

53 |
0.3 |
75 |
1.5 |
75 |
1.9 |

60 |
0.4 |
100 |
1.6 |
100 |
2.0 |

66 |
0.5 |
150 |
1.8 |
150 |
2.2 |

76 |
0.6 |
200 |
1.9 |
200 |
2.3 |

84 |
0.7 |
300 |
2.1 |
300 |
2.5 |

94 |
0.8 |
400 |
2.1 |
400 |
2.6 |

105 |
0.9 |
800 |
2.5 |
800 |
2.9 |

128 |
1.0 |
1000 |
2.6 |
1000 |
3.0 |

Langelier Saturation Index (SI) |
Condition |

-0.5 < SI <0.5 |
balanced |

> 0.5 |
scale forming over saturated |

< 0.5 |
corrosive under saturated |

Inputs:

Conversions:

pH =0 =0 |

temperature factor (TF) =0 =0 |

calcium hardness factor (CF) =0 =0 |

alkalinity factor (AF) =0 =0 |

Solution:

Langelier Saturation Index (SI) =NOT CALCULATED |

Select an equation to solve for a different unknown

Langelier Saturation Index | |

pH (test kit) | |

temperature factor | |

calcium hardness factor | |

alkalinity factor |

turnover rate or time | |

pool volume or size | |

pump flow rate |

References - Books:

Haan, William D. and Johanningsmeier, Julie S. Swimming Pool Pest Management: A Training Manual for Commercial Pesticide Applicators and Swimming Pool Operators. Kent County Health Department and Michigan State University. Unknown date.

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