82 



The Philippine Journal of Science 



1916 



Table XIV. — Comparison of turbidity and bacterial content of water in 

 swimming pools — Continued. 



^ POOL rn. 



Age of water in 

 days. 



VII. No disin- 

 fectant. 



V. One part per 

 million copper sul- 

 phate. 



VI. Two parts per 



million copper 



sulphate. 



IV. Two parts per 



million chlorine 



from calcium 



hypochlorite. 



Turbi- 

 dity. 



Bacteria 

 per CC. 



Turbi- 

 dity. 



Bacteria 

 per CC. 



Turbi- 

 dity. 



Bacteria 

 per CC. 



Turbi- 

 dity. 



Bacteria 

 per CC. 



1 







11.7 

 11.3 

 11.3 

 9.7 

 10.5 



26.700 



55,200 



100,500 



115,000 



55,000 



20 

 12 



125,000 



150,000 



as nnn 



16 



10.1 



10.1 



12.6 



12.9 



10.5 



12,500 



140 



7 



50,000 



123,500 



6,600 



2. 







8 



15.5 

 14.5 

 15 

 15.5 



24,000 



70,000 



145,000 



1,220,000 



4 



4,650 



14 3, 500 



13 ^ sfin nm 



5 



6 





i 







25°C. on agar. 



37 °C. on agar. 



TSCtOOOf 

 700000 - 

 tSMOO - 

 6001000 - 

 SSOfiOO - 

 SOO.000 - 

 4-SOfiOO ■ 

 tOOfiOO - 

 liOfiOO - 

 300/100 ■ 

 ZSOflOO - 

 201X000 - 

 150,000 



100,000 - 

 itmoo - 























eaijr 





















^)|zr 

























7 





















/ 

























/ 











































I 



1 

 1 











































I 























ii 























1 













































/,' 























, 























/ 













































/ 

































































/ 1 























A 



' / 



















/ 



1 





















/ 



/ 





w 















/ 









iM 















/ 



r 







, IT 













/ 



/ 





f 





'm 













/ 



^ 





















V 







_. — ' ' 







( 





_^ 





< 



y-' 











m 









-"TZ 



\^ 



^ 









m 













































r«i WED. TH. FRt. 



Days of the week. 



n/£i wca 7-«. fUL 



Days of the week. 



Fig. 1. Average daily counts of bacterial growth on agar at 25°C. and 37°C. The solid 

 line was plotted from the data in Table VII ; the dash line, from the data in 

 Table II ; and the dot line, from Table VIII. Only the respective end points 

 are plotted for the curves resulting from the data in Tables III and IV. 



As was anticipated, the addition of the disinfectants caused 

 in pool I an increase in turbidity, further increased with larger 

 amounts of disinfectant. Copper sulphate produced a greater 

 turbidity than calcium hypochlorite. Pool III showed the same 

 relations except that the recorded turbidity of the water to 

 which no disinfectant was added was usually high. While in 

 general an increased turbidity was associated with a decreased 



