4.—(1) Subject to sub-paragraph (2), clinical and pharmacological analyses must be carried out in accordance with scientifically recognised methods and should be suited to the particular characteristics of the natural mineral water and its effects on the human organism, such as diuresis, gastric and intestinal functions, compensation for mineral deficiencies.
(2) Clinical analyses may, in appropriate cases, take the place of analyses referred to in sub-paragraph (1), provided that the consistency and concordance of a substantial number of observations enable the same results to be obtained.