METHDDS OF PURIFVIXG WASH-WATER 271 



water docs ndl curry enough oxygen in solution to su])i.)l_\' the 

 germs wJiicli form the real liltering agency. 



If the intermittent process is used, the first water tiltcred after 

 the inter^-ening periofl should not h)e used. During the inter- 

 mission, or during the tmie that the water is shut off, genns 

 develop and come through the filter-bed with the water that is 

 filtered. 



Advantages of Purifying Wash-water for Butter. — The chief 

 advantage of purifying wash-water for butter is that the keeping 

 quality of the butter is improved, and if the proper skill and 

 care have been applied in the other steps of manufacture, a pure 

 sanitar}- product is obtained. The sanitary efficienc}" reached 

 b}- i)urif\-ing the wash-water constitutes no small considerati(m. 

 tlerm.s producing contagious diseases are thus prevented from 

 spreading. 



