§ Mr. Simon HughesTo ask the Secretary of State for the Environment what is his policy in respect of the use of aluminium sulphate in water treatment works; and if he will make a statement.
§ Mr. Heathcoat-AmoryAluminium sulphate is a very effective coagulant which has been used for many years in the treatment of drinking water. It is listed in the 15th statement of the committee on chemicals and materials of construction for use in public water supply and swimming pools and because of this is authorised for use by water undertakers by virtue of regulation 25(1)(d) of the Water Supply (Water Quality) Regulations 1989. The policy of my right hon. Friend the Secretary of State for the Environment is that levels of residual aluminium and sulphate in drinking water shall not exceed the standards set in these regulations.