Metodología
Calcula pHs, LSI y RSI empíricos con las propiedades ingresadas del agua y aproxima la especiación de carbonatos con constantes de referencia fijas cercanas a 25 °C. Son índices de cribado, no un equilibrio geoquímico completo, una tasa de corrosión ni una recomendación automática de dosis química.
The empirical saturation-pH calculation uses entered water temperature: A = (log10(TDS) - 1)/10, B = -13.12 log10(T + 273) + 34.55, C = log10(calcium hardness) - 0.4, D = log10(alkalinity), and pHs = (9.3 + A + B) - (C + D).
LSI = measured pH - pHs. RSI = 2 pHs - measured pH.
The carbonate-only V1 approximation uses fixed reference constants at approximately 25 deg C: pKa1 = 6.35, pKa2 = 10.33, and Kw = 1e-14. Alpha fractions are calculated from hydrogen concentration and these constants.
Approximate DIC = (alkalinity equivalents - hydroxide + hydrogen)/(alpha1 + 2 alpha2), with alkalinity converted from mg/L as CaCO3 to equivalents per litre.
For current water and an enabled adjusted scenario, LSI uses the respective entered water temperature. Carbonate-only speciation continues to use fixed 25 deg C constants.
Scenario values are entered directly. The tool does not calculate a chemical dose or predict the effect of a treatment process.