Solar salt (or any salt with *nothing* added) should work just fine - that's what I use. Solar salt is typically packaged in a blue bag...but read the label.
It's a coarser grind than pool salt, but it's all the same when it's dissolved.
Last week, pool salt at my local pool store was around $13/40 lb., and solar salt at my local hardware store was around $4.80/40 lb.
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