| 
									 
									Rhythmic rising and falling of the ball 
									indicates positive flow. 
									
									Air bubbles indicate chemical has exhausted. 
									
									Stationary ball indicates no flow. 
									
									Possible problems could be: 
									
										- 
										
										lost prime 
										  
										- 
										
										stopped motor
										  
										- 
										
										plugged injection fitting
										  
										- 
										
										faulty tube or diaphragm
										  
										- 
										
										plugged or dirty 
										footvalve filter   
										- 
										
										chemical has been 
										exhausted for a lengthy period of time
										  
									 
									
									Blue-White recommends using: 
									
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