III. SUPPLEMENTARY QUALIFICATIONS RELATING TO EFFERVESCENT NATURAL MINERAL WATERS U.K.
At source or after bottling, effervescent natural mineral waters give off carbon dioxide spontaneously and in a clearly visible manner under normal conditions of temperature and pressure. They fall into three categories to which the following reserved designations respectively shall apply:
‘naturally carbonated natural mineral water’ means water the carbon dioxide content of which from the spring after decanting, if any, and bottling is the same as at source, taking into account where appropriate the reintroduction of a quantity of carbon dioxide from the same water table or deposit equivalent to that released in the course of those operations and subject to the usual technical tolerances;
‘natural mineral water fortified with gas from the spring’ means water the carbon dioxide content of which from the same water table or the same deposit after decanting, if any, and bottling is greater than that established at source;
‘carbonated natural mineral water’ means water to which has been added carbon dioxide of an origin other than the water table or deposit from which the water comes.