Comment: Thanks deacon

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Thanks deacon

My understanding is that "sea salt" comes from the sea. And whatever impurities/additives find their way in to sea salt are caused by pollution. Himalayan salt on the other hand is mined and is regarded as a "purer" salt. It is also praised as the "better/healthier" salt for the fact that it is loaded with many more minerals(about 80) than any other salt, as well as for the fact of the mining location. You'll also come to find that it has a "stronger" taste, thus you will use less in comparison to table salt.

This link breaks it down rather simply:
http://www.ehow.com/facts_5558810_himalayan-salt-vs-sea-salt...

Here is a pretty good article:
http://www.saltnews.com/2010/08/on-the-purity-of-sea-salt/

and this one contains info on Himalayan salt mineral content:
http://www.atthemeadow.com/shop/Resources/Minerals-in-Pink-H...

This is also a good article on the "cons" if you will, of sea salt:
http://www.naturalnews.com/028724_Himalayan_salt_sea.html

Finally, this article states that a German analysis showed that 10 minerals made up 97% of the salt, sodium chloride being typically about 80% with the rest making up trace minerals:
http://www.canceractive.com/cancer-active-page-link.aspx?n=3076

As for the lamps - they are made of salt, so you don't have to "add" salt per say. Himalayan salt is a "rock" salt, so what you are basically getting is a piece of rock that's been hollowed out for the bulb. In areas of high humidity, the lamp/rock will "sweat", so it's advisable that you place it on a dish or towel. Hope that helped.