Mr. Brian Harrisonasked the Minister of Technology whether the Water Pollution Research Laboratories are investigating the efficiency and reliability of contact stabilisation treatment plants; and whether he will make a statement.
§ Mr. BennYes: An investigation has been carried out and others are likely to follow. It is known from basic studies, that the efficiency of the process, like others of a similar kind, is dependent partly on the sewage being treated and partly on the detail design of the plant.