Hey Bear, you should give the units... drinking water is not 5 ppm As that's for sure. It is more likely 5 parts per billion...

I'm not sure how much actually is taken up and stored in the plant.

The fish ferts it makes sense as predatory fish may bioaccumulate toxins in their bodies, esp. bones, liver, and fatty tissues, and the emulsion is most likely guts and other byproducts of processing.

Great info Bear!