XI, A, 3 Heise and Aguilar: Purification of Swimming Pools 109 



Table V. — Daily variation in quality of water. Addition: 0.5 part of avail- 

 able chlorine (front chloride of lime) per million parts of water. 



[Results expressed as parts per million.] 



Age of water in days. 



Pool I.« 



Pool Il.b 



Pool III.<= 



Chlo- 

 rides 

 (CI). 



Oxygen 



con- 

 sumed 

 (O). 



Chlo- 

 rides 

 (CI). 



Oxygen 



con- 

 sumed 

 (O). 



Chlo- 

 rides 

 (CI). 



Oxygen 

 con- 

 sumed 

 (0). 



1. 



5.5 

 4.2 

 4.5 

 4.5 

 5.3 

 5.0 



0.7 



0.8 



1.6 



0.7 



1.34 



1.35 



4.5 

 4.0 

 5.0 

 5.0 

 5.3 

 5.3 



1.0 



0.7 



0.9 



0.88 



0.87 



1.30 



5.0 

 5.7 

 6.1 

 6.5 



0.75 

 0.7 

 0.72 

 1.39 



2 - 



3._- . 



4 _ . 



5 . 



6 













■ Average temperature, 27.6° C. Total bathers, 424. 

 *> Average temperature, 27.0° C. Total bathers, 298. 

 •= Average temperature, 28.0° C. Total bathers, 70. 



Table VI. — Variation in quality of water. Addition: 1 part of available 

 chlorine {from, chloride of lime) per million parts of water. 



[Results expressed as parts per million.] 



Age of water in days. 



Pool I.» 



Pool Il.b 



Pool III.c 



Chlo- 

 rides 

 (CI). 



Oxygen 



con- 

 sumed. 

 (0). 



Chlo- 

 rides 

 (CI). 



Oxygen 



con- 

 sumed 

 (O). 



Chlo- 

 rides 

 (CI). 



Oxygen 



con- 

 sumed 

 (O). 



1.51 

 1.21 

 1.36 

 1.18 

 1.29 



1 



5.3 

 6.0 

 6.8 

 6.5 

 6.0 



0.74 

 1.24 

 1.02 

 1.00 

 0.97 



4.5 

 5.8 

 6.3 

 6.2 

 6.0 



0.85 

 1.15 

 0.95 

 1.11 

 1.72 



7.1 

 5.9 

 7.1 

 6.7 

 6.5 



2 



3 



4 



5 





* Average temperature, 28.0° C. 

 b Average temperature, 27.0° C. 

 "= Average temperature, 28.5° C. 



Total bathers, 223. 

 Total bathers, 231. 

 Total bathers, 152. 



