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Hello Robert.
That system is used with aeroponics not aquaponics. The liquid fertilizer output is diluted 10:1 with water and then used to feed the plants. I'm quite interested in aquapincs and there has been some use of putting the fish entrails, etc into the digestor creating enough gas to keep the encloser and the water in the tanks warm enough for tilapia. I'll see if I can find that report. I know I saved it. It's must a matter of where I saved it. :-)