I use the Vertex all the time and the only time i get clumpy pellets is when the flow is not sufficient enough to keep them moving around. When they get clumped I just rinse them in RO water really good & put them back in reactor increasing the flow so they are really churning. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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