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Rich, I just got home, and am in no state to answer such a question. Tomorrow I will give you a detailed description. However, as a preview, it comes down to the different forms of iron, i.e. ferrious and ferric. One is toxic to living things and one isn't. The phosphate binding iron compound is iron in the non-toxic state, while metal that rusts and releases iron into your tank water is iron in the toxic state. |