166 



DONALD W. STRASBURG 



films flowing down the cabinet walls, 

 water drops falling cleanly through per- 

 forations aligned by chance, occasional 

 stream-flow through a perforation, and 

 the difficulty in adding oxygen to water as 

 the saturation point is approached. 



The second interesting feature of figure 

 5 is the relative importance of tray spac- 

 ing versus number of trays. Although 

 the same degree of saturation can be at- 

 tained with either a few widely spaced 



trays or several closely spaced ones, there 

 are practical considerations to be borne 

 in mind when planning a definitive aera- 

 tor. Wide tray spacing results in a tall 

 aerator, requiring considerable pressure 

 for pumping water to the top. Narrow 

 tray spacing means a short device with 

 numerous trays, the latter sometimes being 

 expensive to construct and usually diffi- 

 cult to clean. Figure 6 shows the relative 

 unimportance of tray spacing, for a con- 



3'-8" 



5 OPENING 



3 ROWS OF 

 16 TRAYS 



8'-6"DIA. CONCRETE 

 TANK-HEIGHT 4'-8" 



WATER OUTLET 

 4" PIPE 



Figure 7. — Aerator developed for use with salt well water. 



