Do a search on it and you'll find plenty about it. You will find that it's not worth getting, as all you need to do is keep your Alk & Cal levels up, and possible add some coraline algae scrapings, to get the same results.
I have used it and can attest that it is a calcium additive and an iodine additive as well. That being said, I have learned that it is better to dose things individually because you may only need a lil of this and a lil bit more of that instead of lots of both if you get my inference. Also never dose anything you don't test for.