HC Deb 07 May 1952 vol 500 c47W
Mr. Viant

asked the Minister of Housing and Local Government whether, in fluoridation of water supplies, the fluorine is added in the form of salts, or in what other form is it added.

Mr. H. Macmillan

In this country fluoride is not yet added to water supplies. In the United States of America, however, there is a growing practice to make such an addition and the fluoride is usually added as sodium fluoride, sodium silico-fluoride (fluosilicate) or hydrofluosilicic acid. The first two of these compounds are solid salts, but are usually made into an aqueous solution before adding to the water. Hydrofluosilicic acid is purchased as an aqueous solution.