The seawater lines to my air conditioning system have a pretty thick layer of green scum in them. I'm thinking about taking a few short lengths of scrap copper plumbing pipe that are laying around my garage and dropping them into the basket of my Perko seawater strainer. My thinking is that the seawater moving through the system should pick up some copper ions on the way and eventually kill the growth in the lines. Do you think this would work? Or would it actually take a biocide flush to do the job?