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Table 1 Composition of the three waters used in the intervention study. (1)Valvert®; (2)Distilled water+MgSO4; (3)Contrex®.

From: Mineral water intake reduces blood pressure among subjects with low urinary magnesium and calcium levels

Waters Minerals/mg L

A1

B2

C3

Calcium (Ca2+)

67.6

4

486

Magnesium (Mg2+)

2

82.3

84

Sodium (Na+)

1.9

2.4

9.1

Potassium (K+)

0.2

0.1

3.2

Sulphate (SO4 2-)

18

326

1187

Bicarbonate (HCO3 -)

204

12

403

Chloride (Cl-)

4

0.7

8.6

Fluoride (F-)0

<0.05

0

0.32

Silica (SiO2)

5.7

0

8