I am clearly out of my league here, but I think the ecoli issue needs to be clarified
Ecoli is an issue as you mention above because of outside contamination
Fish do not carry ecoli, and therefore this would not be an issue with a closed loop
Backyard system, unless ecoli was introduced from another source (ie humans)
Gallop,
Thanks. I think Cat and I know that, but it's good you brought it up so others can makes sure they understand that.
I think one of the many strong points of Aquaponics if done without any contamination by outside mammal excretion is the lack of ecoli.