White crystals growing on pole left in the pool ...

I'm new here and the process is just starting to penetrate my thick skull, so my apologies to the powers that be.

Here are my questions:

I live in Arizona where the water is hard.

Sometimes, being less diligent than I should be, I leave my pool pole in the water for a few days.

I've always noticed that white crystals will start to seed and grow on various points of the pole where the blue coating is scratched.

Generally, is this a bad thing?

Is aluminum dissolving into my pool water?

Is that calcium coming out of solution such that my water is getting very slightly less hard? If so, should I do this more?

I'm hoping that this isn't a rare and unknown phenomenon (since it was very easy to have happen).

Thank you for your time.

It's some sort of aluminum corrosion -- aluminum chloride, I'd guess, but I don't know.

Sometimes, it will get a jelly-like consistency, though that may be aluminum hydroxide.

The simply solution is to not leave your pole in the pool . . .