Nemo, it depends on what you read and what the author has to say about stuff. If you read the S-15 Report then Marine Environment is the best, if you live on the east coast it would seem Tropic Marin is the favoured salt. If you read the link above then Marine Mix is the best.
I guess it depends on what you like to use. If you believe in your salt I think it's the best salt you can use. I used to swear by Kent salt (manufactered for Kent by Instand Ocean) it was always consistant and mixed up easy. When I changed to IO salt I didn't notice any decrease in health etc and it worked for me just fine.
Doug
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