OK I need to protect my pond with something that will keep a family of otters out. The construction of the pond has loose river rock around the edge and in the front there is no dirt to anchor the support rods for the electric wires. I have read that the electric wire needs to be well grounded but is that at each post? I have a good netting that I use in the winter but its the last thing I want 24/7. Any other ideas.