MEDIUM-SIZED SEA-WATER SYSTEM 



37 



PUMP- OFF POSITION 



s PUMP- ON POSITION 



PCWER 

 SUPPLY 

 TO PUMP 



WATER 

 FROM 

 PUMP 





BACKWASH 

 ^-OUTLET 



BACKWASH 

 INLET 



FILTERED 



WATER 



FIETURN 



Figure 2. — Filtering and cooling details. 



Alternatively, the cooling coils (glass 

 tubing is satisfactory) may be included in 

 the aquariums or the aquariums may be 

 surrounded by a bath of running water. 



The system illustrated here may, if de- 

 sired, be very simply constructed of ma- 

 terials found in most laboratories. A 

 wooden barrel will serve as a reservoir, 



and ordinary glass aquariums may be set 

 in series with water siphoned from one 

 to another. If the pump is located below 

 the aquariums, it need not be self-priming. 

 Our filter tanks are about one-third the 

 capacity of the associated aquariums, but 

 this is largely a matter of convenience 

 since the rate of filtering can be adjusted. 



