I'm gonna come with a whole different question:
I understand the concept, the theories, the fast flow through the coils, the slow flow through the bio materia, and even the "bigger isn't necessarily better".
But what I DON'T understand is how you can design it to have a fast flow-in rate, and a slow flow-out rate? This is a sealed unit right? So if you put say 100gph flow rate into the unit, it seems logic to me that you will get an output flow rate of 100gph out of the unit? Did I miss something along the line?
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