Well the thing is, it's more of a natural pond than a artificial koi pond, and there's going to be potential for bugs and stuff living in the Hornwort. Some of which you don't want to be sending to your potential customers. Have you tested the water for pH, hardness, and any pollution or other run-off. It would be good to at least get some basic parameters on the water, possibility of septic tank effluent or microbes. Basically a lot of things that are probably OK in the pond but not something you'ld want to share in someone's pond or aquarium.