GENERAL DIRECTIONS. 51 



Directions. 



When the filter ceases to act satisfactorily, it may be detached 

 from the pipe by unscrewing the union which is immediately above 

 the cap of the filter, the filter taken out of the cistern, and the char- 

 coal removed and cleansed, or replaced by new. To effect this the 

 cap of the filter must be removed by knocking the claws of the 

 iron holding the cap down, round on the graduated edge to the 

 thinnest part of it, when the openings in the edge will allow the 

 iron being taken off and the cap then removed from the filter. 

 The strainer must then be removed, after which the charcoal 

 must be shaken out. 



It should be left to soak in lukewarm water for 

 To Cleanse the a ghort ti which m free - t surface of or . 

 Charcoal. 



ganic matter, and afterwards well washed in 



clean water. The water in which the charcoal is washed will 

 always be black, and affords no guide to the charcoal being clean. 

 After washing, the charcoal must be dried and sifted into two 

 portions No. 1, the very coarse ; No. 2, the remainder. 



First put in No. 1 (the very coarse charcoal) to 



Filter m the the depth f 1 r l * inches ; then the b dy f the 

 charcoal, No. 2, may be put in, the filter being 



kept in constant motion by raising it a little on one side, and 

 allowing it to receive a slight downward jerk on whatever it 

 may be standing, the filter being turned occasionally to ensure 

 the motion being equally distributed. By this means a much 

 larger body of charcoal may be got in, for after being apparently 

 full many times it will be found still capable of holding more. 

 The last 1 or 2 inches should be the remainder of No. 1 char- 

 coal. The strainer must be then replaced by agitating the filter 

 as before described, and pressing it upon the charcoal, which will 

 cause the charcoal to gather well round the strainer. The cap 

 and rubber-washer must be fixed as before, the iron claw knocked 

 round carefully with a mallet to its original position, and it is 

 ready for use. 



E 2 



