§ Mr. EtheringtonTo ask the Secretary of State for Health what estimate he has made of the amount of fluoride required annually by a water company artificially to fluoridate public water supplies for a population of 300,800. [6794]
§ Mr. ClappisonI have been asked to reply.
On the assumption that the total water supply amounts to about 60 million litres per day, the drinking water inspectorate has estimated that it would require each year approximately 150 tonnes of 20 per cent. by weight hexafluorosilicic acid, the chemical which is normally used to fluoridate water supplies.