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These are sold at a wide range of prices and typically have 10% porosity. That means a 30-gram saver will soak up only 3 grams of water. If they are actually made of terra cotta clay then they contain what typical terra cotta clays contain: soluble salts that will effloresce (be brought to the surface by the water leaving a white stain on edges). And, if they are real, they contain other things: Terra cotta clays are nature's trace element who's who of the periodic table of elements. While higher temperature red burning clays are also trace element libraries, they are to a much lesser degree.
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Better Porosity Clay for Brown Sugar Savers
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