I wouldn't worry about that as my disclaimer, however I don't know anything about your water. You might consider distilled water if you are not already using it. If you have hard water coming out of your tap it's just a consideration.
that could also be calcium - if that is salt, I would def look into your water - I have been to the Galapagos islands, that would be alot of salt even for an iggy -
cute little guy =)