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Thanks for the support. You are very correct in your deduction. Aquaponics in a closed loop is not sustainable.. reasons being like all things there need to be a purge in order for everything to be healthy. In Aquaponics it isn't the lack of nutrients that causes plant growth problems.. it the accumulation of Nitrates faster than others nutrients that crashes the system. The Nitrogen ratio to everything else is way too high.. coupled onto the high pH.. is a recipe for disaster.. so to combat this you need to have a purge of water from your system to balance the Nitrates off.. however the curse becomes a blessing when you use the water for coco grow. By pumping the Aquaponics water into a small reservoir that you use for daily watering.. you can treat the pH and add additional nutes to balance off the water for better quality grows. Atleast in theory.. to daily water acts as your system purge at the same time. So after a period of time.. you can naturally balance off the system so you will not need to add supplemental nutrients any more..Curious to see how this goes.
I tried aquaponics at my farm with tilapia - It was a miserable failure. It seems to me like the needs of the fish and the needs of the plants are somewhat similar, but not close enough for it to be a closed system. The amount of fish you need to produce waste to feed the plants is pretty high. And then with the pool being open to the air / sun - you add nutrients and they almost before your eyes become algae. It's a balancing act for sure.
I'm following along because I hope someone figures this out - might as well be you! Good luck.
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