What does water saturation index mean in practice?
The index compares the current composition with the equilibrium of a given mineral and predicts the thermodynamic direction of dissolution or precipitation.
When does it matter?
It does not describe the reaction rate or all corrosion mechanisms, so the result requires material and process interpretation.
Which solutions are related to it?
It is calculated from complete data at operating temperature and verified by observation of deposits and corrosion coupons.