Pool bond question. Potential difference

[electricblue]

Looking at a concrete pool that had a spa added. Pool builder says he chipped into existing pool shell to rebar in 4 spots to reach rebar and rebond then ran a ring around the pool and spa. There is a tingling when touching the pool water and spa water. .668 volts from spa to pool water. I say the old pool is not bonded and at a different potential from the new spa and fire bowls that all have continuity back to the pump. I just want to run this by someone here to double check myself before I have him start pulling up deck and looking into the bond.

 

[winnie]

How did you measure the voltage, and could it have been a DC measurement?

Is the voltage present with power off?

Are there different equipment terminals ( eg. pool and spa pumps) where you can take a resistance measurement?