That's mean generally, the aquifer fluids are very close to equilibrium with calcite, and when all uncertainties were considered such as analytical imprecision and selection of aquifer temperatures, departure from saturation is not significant.

The calculated saturation index for calcite increases with increasing value of the

calculated aquifer pH. This is considered to be due to error in the calculated aquifer

water pH. Many factors affect the calculated pH and it is not possible to identify the

main sources of apparent variation in pH and calcite saturation index but it seems to

be significant.

PHREEQC software is used to set up the hydrogeochemical components of the groundwater, especially the saturation parameters for carbonate minerals (calcite, aragonite and high-Mg minerals), to test the mineral saturation and to eliminate the reactions that are thermodynamically invalid. A negative SI value defines the dissolution process, a positive SI value explains the precipitation process, while a 0 value of SI indicates the equilibrium state of carbonate minerals.

Hello dear colleague

Thank you very much for your answers.

Best regards

Hello dear colleague Ashkan

Thank you very much for your benific answers.

Best regards

use this paper for more

Significance of saturation index of certain clay minerals in shallow coastal groundwater, in and around Kalpakkam, Tamil Nadu, India