Seachem Reef Advantage MagnesiumA concentrated (80,000 ppm), optimized blend of magnesium, chloride, and sulfate salts formulated to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural seawater. A 600-gram bottle treats 2,500 gallons (10,000 liters). International customers: Check with your customs agent to determine whether this product can be shipped to your country.
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