directly under the filter beds. T'wo Tg^hp. centrifugal pumps (one a standby), 

 located 15 feet below ground level, pump the water from the sump back to the 

 redwood storage tanks, thus completing the cycle. The system is designed 

 to circulate a maximum of 8, 000 gallons of sea water an hour. The plastic 

 valves and piping and the concrete return troughs and sump minimize the dan- 

 ger of metal contamination. Both laboratory and filter house are insulated, 

 and the laboratory is air-conditioned to maintain the water at a relatively con- 

 stant temperature. 



T ^ 



East tank room showing the two tiers of fiber-glass 

 tanks and a third tier of glass aquaria. 



The three tank rooms cover more than 1, 000 square feet of space 

 and contain a sufficient variety of sizes of redwood, fiberglass, and plate- 

 glass tanks to give the individual investigator a wide selection for his partic- 

 ular needs. In the east tank room (Laboratory A), which has an area of 428 

 square feet, advantage is taken of the high outlets by arranging the tanks in 

 three tiers along one wall. Eventually all tanks in this room will be simi- 

 larly arranged. 



69 



