I'd look for too much bromine and/or low pH (acidic) first. If the pool is carbon steel or aluminum with copper piping, the steel/alum are more anodic and would more likely be the victim of galvanic corrosion rather than the copper.
Dsparks, are you aware that the purpose of the bonding grid in a swimming pool is to eliminate voltage gradients. And, if there is water in a swimmers ear, voltage gradients as low as 4V is enough to cause disorientation and drowning. Have you ever seen impressed current cathodic protection or similar used in swimming pools, I am aware of it's use on tanks, pipelines and boats. My gut instinct is to strongly oppose your casual suggestion to toss a charge into the pool and see if it stops the corrosion.
Phil H
