[nkmnz]

salt crusts are highly reflective, driving down light exposure pretty fast. Plus, salt water is corrosive.

[danuker]

> salt crusts are highly reflective

I think this will not be a problem, as the salt would be continuously washed away with new water. But the corrosion would be a problem indeed.

Maybe some plastic/epoxy/glass casing would help, but it might also hinder recyclability.