§ Mrs. Helen Jackson
To ask the Secretary of State for the Environment what reports he has received from the 421W drinking water inspectorate on the addition of aluminium sulphate to remove discolouration from drinking water supplies. 
§ Mr. Clappison
The drinking water inspectorate has made no reports about the use of aluminium sulphate in drinking water treatment.
Aluminium compounds have long been established in most parts of the world as coagulants in water treatment and their use is considered unobjectional on health grounds.