I have the same problem with my Vertex calcium reactor.  It started while I was on vacation, after using the reactor with no problems for over 6 months.  Since then I tried everything; burping the gas recirc line, messing with the pump, etc.  I even contacted the Vertex people and they didn't have a good explanation or suggestion.  So, I'll be watching this thread with great interest.... 
		
	
		
		
		
		
		
	
		
		
	
	
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