For me biopellets are great.  I am not a daily doser person.  I shake my reactor once or twice a week if I remember.    
 
I'm using a modified tlf550.   It works alright.  Problem with the tlf550 is the 90 deg elbows inside restrict flow a lot!   That's the only reason why I need to shake the reactor.   
 
I started with only 100ml in the reactor then after a few weeks added more and so on.  Started very slow and saw no ill affects. 
		
	
		
		
		
		
			
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Mike.   
			 
		
		
		
		
	
		
		
	
	
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