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Re: Aquatic Plants Digest V4 #431

At 03:48 AM 7/25/00 -0400, Neil wrote:
>Iodine is not added to table salt because people need it but purely to make
>it flow better as normal cooking salt which has is not iodised tends to mix
>freely with water and as such would clog up the salt shaker etc. and goes
>hard with moisture from the air as salt is hydroscopic. Iodised salt in high
>concentrations is poisonous to fish and should not be used in an aquarium
>only natural or non idodised salt is suitable.

Neil, this is another example of chemistry which only applies in the 
Southern Hemisphere.  Up here iodine is added as a nutritional supplement 
(prevents some goiters, enlargements of the thyroid gland) and sodium 
silicoaluminate (or some such) is used to keep the salt from caking due to 
absorption of moisture.   So up here table salt works fine, because there 
is insufficient of any adulterant to adversely affect fish.