My parents' had a swimming pool installed at their home last summer and there was a problem with stray voltage right from the start. We all thought it could be something grounded wrong from the new panel or power feed to the filter untill we turned off all of the power to the new panel. The stray voltage still did not go away. We tested with the positive terminal in the water and the negative terminal to ground and the meter read usually between (2) and (3) volts. (This was the strongest (3) volts I've ever felt). They were very upset thinking that this problem would never go away and then one day it was gone. They figured out that the stray voltage dissapeared at exactly the same time that they installed the new landscaping stone in the 3' void between the concrete around the pool and the garage. Needless to say, the pool is much more relaxing now that the stray voltage is not a problem.