Magnesium sulfate heptahydrate 1kg Quality Level: pure superior to 99.0%, stearate, USP, E 511 Magnesium sulfate is used together with magnesium chloride, the simple increase in the magnesium content of saltwater aquarium. Brief instructions taking into account the ion equilibrium: Loosen 380 g of magnesium chloride hexahydrate and 48 g of magnesium sulfate...