§ 61. Mr. MORRISasked the Minister of Health if he is aware that local authorities are proposing to adopt the process of adding silicate of soda to soft water in order to prevent the solvent action of the water on lead pipes; whether this process has been investigated by the Ministry of Health; and whether, in view of the toxic action of silica under certain conditions, he will order that the use of this process be discontinued?
§ Sir K. WOODMy right hon. Friend is aware that this process has been adopted in a few districts, mainly on an experimental scale. The quantity of silicate of soda used is so small that the proportion in the treated water is much less than that contained in many natural waters used for domestic supplies. The results of the treatment are being carefully watched, and, upon the information so far available, there appears to be no reason to apprehend any danger to health or any diminution in the wholesomeness of the water.
§ Mr. MORRISHas the Ministry itself made any investigation ink, the toxic qualities of silicate of soda, and have they taken the opinion of any expert toxicologist on this matter?
§ Sir K. WOODMy right hon. Friend is satisfied that there is no need for any apprehension on this matter. If the hon. Gentleman has any further information, I shall be glad to receive it.
§ Mr. MORRISDid the Minister of Health, before this process was adopted, consult Sir William Willcox, who is, probably, the leading toxicologist in this country?