SWC aiptasia zapper just arrived...

[asylumdown]

and I'm not sure if it works or not. In all the videos I've seen of these things online, the probe makes bubbles when it's on under water. I'm at work, so I tried putting the tip of the probe in a cup of tap water and nothing happened.

It also doesn't feel like there's any electricity moving through it when it's on (yes, I was that kid who couldn't resist putting their finger in the light-socket).

The packaging it came in was pretty trashed (I really hate UPS), and a small piece of plastic that was glued on to the body of the shaft that seems to have no practical purpose had broken off, but otherwise it's totally intact.

At the opposite end of the mettal zapping part, there's what looks to be a piece of graphite with wires coiled around it. Only the the very end of the graphite is exposed, so I'm not sure if that also needs to be submerged for it to work.

Do they only work when fully submerged in salt water? Or is mine busted?