Compared to some other things that I buy for my aquariums $50 doesn't seem that bad and as I understand it the 15% will last as long as the reactor media so in my experience at least 6-8 months. I suspect that it is probably some kind of dolomite (I think that is what it is called) material. I'm going to put it in my reactor on my 230g because I have to add new media to that in the next month and on my 190g it looks like I will be another 6 months or so before I have to add any media so it will give me a chance to monitor if it makes a difference.
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