A slight "shock"

So I have noticed lately that when I have a cut on my hand or something and I reach down in the skimmer, I feel a small shock. At first, I didn't worry about it thinking it was the chemicals getting into the cut. But my wife has mentioned it too. So I started searching and reading and figured out that it's not the cut. I don't remember noticing this after the pool was first installed, so I can't say if it's been happening the whole time or not.

I did notice that if I have shoes on and...

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