Dolomite is a natural product that can be used in calcium reactors to increase magnesium level of sea water.
Container Size: 1 Liter.
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Tub of Gravel Review by
But its the right kind of gravel. I use this in the filters of my planted tanks. It gently contributes calcium and magnesium back into the water and naturally stabilizes hardness and PH. (Posted on 7/5/2009)