398 G. J. BURROWS. 



This is equivalent to an extra cost of about Jd. to fd. per 

 1,000 gallons. 



It is possible that on a large scale a greater proportion 

 of alumino-ferric would be required than that used in the 

 above experiments. The amount would depend upon the 

 time which could be allowed for settlement and could 

 best be determined by an actual trial at the water works. 

 In the author's opinion the use of a clarifying agent, such 

 as alumino-ferric, would greatly improve the water supply 

 and although the laboratory experiments show that the 

 clarified water is not fit for drinking purposes, it is possible 

 that on the large scale with an efficient sand filtration 

 process the water might be rendered suitable for all pur- 

 poses. The Municipality of Goulburn is strongly recom- 

 mended to test the effect of alumino-ferric on the large 

 scale with the plant at present at their disposal. If the 

 water is sufficiently improved to be suitable for all purposes, 

 the plant could be increased to deal with the maximum 

 amount of water required ; if not, a new source of supply 

 must be sought. In conclusion I desire to thank Professor 

 Schofield for affording me the opportunity of performing 

 these experiments and also for much advice during the 

 work. 



