Sodium
Santa Croce water is low in sodium:  only 0,95 mg/l. Sodium regulates the body’s water content (retention) Small doses help combat hypertension and water retention. Doses that are too high worsen cardio circulatory problems. The maximum admissible sodium concentration established by the WHO is 120 mg/l Santa Croce with only 0,95 mg/l is specifically indicated for a hyposodic diet.
Less Sodium, less water retention.