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The School of Aquaponics

I think the design is fine. I never like when water comes back to the sump where water is going back to fish before going to through the system which acts as the filter. I understood immediately what the person meant. water goes through the whole system before coming back to the sump thus removing nitrates and amonia. having the water go from the swirl filter, back to the sump, then back to the fish is not truly filtering the water. At this stage of my life I am more of an aquarist than an aquaponic farmer. The beds are the filter, and you don't skip the filter if you want nitrates/amonia to zero (or as close as possibe) by the time it comes back to the fish.
Good stuff:) Wont the fodder rot out if you keep water running through it? Also, wont the run off from the fodder affect the pH and nitrates? I would think it would dirty up the water.
Under the 'improved design' would a larger pump be needed? If so, what about the cost effectiveness of the larger pump needed? [how much more $/month, required?]
wouldn't the media bed help filter the water before returning to the sump?