154 



On account of the expense it is practically impossible to provide for 

 a continuous change of the water. The filtration of the pool water after 

 use also involves some trouble and expense. The use of certain disin- 



h-W 





t» >. 



+a « 



3-1 



M ~ 



© o 



^ l» 



£ ffl 



© 



-} © 



ja ° 



+3 a 



08 



PQ 



fectants would seem to be more simple and economical. The writer would 

 criticise the liquid or fluid chemicals as being harder to apply to the pool 



