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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