LSI (Langelier Saturation Index) calculator
PROLangelier Saturation Index — target between -0.3 and +0.3.
Inputs
Result
LSI
-0.19
Balanced
The formula
LSI = pH + TF + CF + AF − TDS constant.
Worked example
pH 7.5, 78°F, CH 250, TA 100, TDS 1000 → LSI ≈ 0.0 (balanced).
Frequently asked
›Target range?
-0.3 to +0.3. Below = corrosive; above = scale forming.