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Reef Advantage Magnesium" is a concentrated (80,000 ppm)  optimized blend of magnesium, chloride, and sulfate salts designed to restore  depleted levels of magnesium with minimal impact to the ionic ratios found in  natural sea water. Reef Advantage Magnesium" contains no ammonia! This is a  common contaminant in every liquid magnesium supplement on the market. 
 Severely depleted levels of magnesium (below 800 mg/L) can cause depressed pH  levels and an inability to maintain proper calcium levels. Magnesium depletion  is commonly associated with the use of kalkwasser.