I have being struggling with this problem since I built my fiberglass inground pool in 2002. When I am in the pool and touch wet concrete of my pool deck with part of my body with sensitive skin or skin with even small abrasion I get burning sensation. I measured this current and it is around 2.5V DC. I suspected current leakage from power company inground cable supplying electricity to my house and asked them to investigate it. They sent a guy that installed some kind of box on my ground reebar and left it there for few days. After few day box disapeared and I have never heard from them. I just learned to live with it assuming that it is not life threatening. After coming accross this blog my concern for safety reemerged. I installed the pool myself and have followed the code for grounding and wireing plus I had it inspected by building inspector. All of the components of the pool are grounded to ground reebar. I run a test where I disconnected everything from the power source and the ground and the current was still there. It does not make any sence. Is there any way to eliminate this problem? Thanks in advance for any suggestion.