I wanted to chime in on this having scotty black box on my boat. THeir is galvanic reaction in saltwater also in fresh. The added minerals and salt multiply the problem. So does it work in freshwater answer is yes. the other ? is will it work for mooching. I have never tried it but part of what they talk about is it attracts fish with a slight electrical charge. My guess is if you lowered you downrigger ball and turned on your black box. That it may attract some fish to the electic pulse. I just found out that their is a new lure coming out. Its called a roto chip bait holder. It is the same as other bait holders for whole heering but has a small chip in it that puts off a small electric current mimicing the same current put off by a heering. Got to get a couple of those to add to my arsenal.