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I was looking for information on the web. There are apparently two problems with burning driftwood. 1) Burning driftwood releases polychlorinated dibenzodioxins (PCDDs) which are carcinogenic due to the chlorine content in the salt. Most of it would go up the chimney, but it is still bad for the environment.2) The salt may react with metal wood stoves, fireplace inserts and liners, and metal flues. It would be less of a problem for a 100% masonry fireplace, but there are often a few steel components associated with even masonry fireplaces.Here is a long discussion. It quickly turned from positive to negative.http://ths.gardenweb.com/forums/load/firepl/msg0912544110124.html