Ummm, should we be worried?

[ThePapa]

Why is the tank charged?
That is a voltage indicator in my grandson's hand at my daughter's house.

 

[ThePapa]

Yes you should be concerned and keep your hands out of the water until this is resolved!
This goes beck to the R2R discussion about electricity and salt water. In your case you have an ungrounded pump in the system. I would disconnect the pump and see if the condition changes, I will assume that is the source. In the future get three prong grounded pumps and circulators so the GFI can do it's thing. A good voltmeter can also be used in testing. That is my guess until more information is obtained.

 

[Kami2011]

I say you should get some titanium grounding probes...

 

[twilliard]

Those are notorious for picking up static electricity
To show rub it against you pant leg or shirt.
Electricians typically don't use them as they also pick up stray voltages

 

[Kungpaoshizi]

With every tank I set up, I use a ground probe. 2 prong stuff is notorious for leaking slight current.

 

[ThePapa]

Those are notorious for picking up static electricity
To show rub it against you pant leg or shirt.
Electricians typically don't use them as they also pick up stray voltages

Yes they are not my go to and are not perfect. I have other DVM's I use to verify things. I will know more in a few days when I can get my hands on her stuff. Her son was playing with the voltage indicator and it went off repeatedly. She disconnected the in tank circulating pump and the problem went away. If you have ever been mounting a microwave oven and run a screw through the 220v range feed in the stud wall it is worth checking with one.

 

[ThePapa]

I say you should get some titanium grounding probes...

I agree and have passed on your recommendation.

 

[ThePapa]

Those are notorious for picking up static electricity
To show rub it against you pant leg or shirt.
Electricians typically don't use them as they also pick up stray voltages

I was able to get my hands on her tank the other day so with nothing in the tank pluged in I was able to read 9 VAC between ground and the salt water with a Fluke DVM. Induced voltage from a nearby power cord?

 

[twilliard]

It can be as even in my own tank I am getting 3.5v from an unknown source.
The biggest question in my mind is it able to carry current

 

[TheEngineer]

I was able to get my hands on her tank the other day so with nothing in the tank pluged in I was able to read 9 VAC between ground and the salt water with a Fluke DVM. Induced voltage from a nearby power cord?

There was nothing in the tank that was connected to a wall and you read an AC voltage?

EDIT: Assuming the answer to the above was that nothing was plugged in that was in the tank, does the tank have fluorescent lighting and was it on?

 

[twilliard]

Oops I read right over that (not enough coffee yet)

Nothing was plugged in?