XI, B, 2 



Gabel: Examinations of Swimming Pools 



77 



Table VII. — No disinfectant added to water in swimming pools, week of 



October 25 to 30, 1915. 



[Bacteria per cubic centimeter of water.] 





Oct. 25. 



Oct. 26. 



Oct. 27. 



Oct. 28. 



Oct. 29. 



Oct. 30. 



Pool I: 



Agar, 25° C 



60 

 BOO 



1,600 

 17,000 



12,000 

 16,000 



240, 000 

 300,000 



80,000 

 100. 000 



380,000 

 720.000 



Agar, 37° C— 







280 9.300 



14, 000 



270, 000 90, 000 



650,000 



Pool II: 



Agar, 25° C — 



BO 

 1,000 



28, 000 

 40,000 



100, 000 

 120,000 



120,000 

 180,000 



600,000 

 600,000 



800,000 

 1, 400, 000 



Agar, 37° C- - 



Average 



525 



34, 000 110, 000 



150, 000 



550,000 



1,100,000 



Pool III; 



Agar, 25° C 







19,000 

 29,000 



40,000 

 100,000 



90,000 

 200. 000 



940, 000 

 1, 500, 000 



Agar. 37° C 







Average 













24,000 



70.000 



145, 000 



1,220,000 









Table VIII. — One-half part per million of available chlorine as calcium, hypo- 

 chlorite, added daily to water in swimming pools, week of November 



1 to 6, 1915. 



[Bacteria per cubic centimeter of water.] 





Nov. 1. 



Nov. 2. 



Nov. 3. 



Nov. 4. 



Nov. 5. 



Nov. 6. 



Pool I: 



Agar, 25° C 



100 



200 



30 

 100 



60 

 80 





 40 



80 

 300 





 6 



Agar, 37° C. 





160 



65 



70 



20 



190 



3 



Pool III: 



Agar, 25° C 



30,000 

 340,000 





40 

 100 



170 

 280 



100 

 660 





Agar, 37° C 





BOO 



Average 









70 



225 



330 













Table IX. — One-half part per million of available chlorine as calcium 

 hypochlorite, added daily to water in swimming pools, week of Novem- 

 ber 8 to 13, 1915. Second week in use. 



[Bacteria per cubic centimeter of water.] 





Nov. 8. 



Nov. 9. 



Nov. 10. 



Nov. 11. 



Nov. 12. 



Nov. 13. 



Pool I: 



Agar. 25° C 



20,000 

 23,000 



2,700 

 9,600 



60 



400 



80 

 170 



200 

 10, 000 



10 

 300 



Agar, 37° C 



Average 



21. 600 



6,150 



230 



100 



5,100 



155 



Pool III: 



Agar, 25° C 



68,000 

 60,000 



400 

 1,000 



40 

 800 



2,300 

 5,700 



30 

 1,600 



100 

 600 



Agar, 37° C — 





64.000 



700 



420 



4,000 



816 



360 





