I have a 1 ounce packet I've been using for months, I got it on Ebay.
I see what you're saying about the round shape, but i would think if you just put them all in a strainer, you could rinse the crystals, too.
It's what they did when the person in the video smashed them that makes me think they're the same substance.

I don't think they would cause any more condensation than plain water.