How I kill massive amounts of flies without chemicals, etc...

[chickengeorgeto]

.... I designed and installed a huge fly zapper. I basically took a store bought bug zapper and wired it up to hardware cloth that covers a window. I found a window with direct sun rays (instead of the UV zapper bulb) coming in attracts the most flies to the zapper....

Mavrik, I have a question. If you use a piece of hardware cloth as your positive or hot side of your electric grid, what object or material do you use to provide a ground or negative grid to complete the electric circuit and provide the killing field as it were by the flys touching both the hot and the ground wires simultaneously? This seems to me like it is a very good question.

Also now do you insulate your hot grid (hardware cloth) so that you do not have a continuous short circuit.