Reef Magnesium Chloride-8.8lb Dry Goods Pharmaceutical Grade MGCl


• Package makes approximately 1 gallon of Magnesium Supplement
• Dissolves completely and easily in purified water
• Lab tested and pharmaceutical grade
• Phosphate and Ammonia free

Recommended Dosage: 1000ml or 880grams makes 1 gallon of high quality supplement

Instructions for use:  Add 1000ml of the Magnesium Chloride Hexahydrate into a clean dry 1 gallon container. Fill the container about ¾ full with RO/DI or filtered water; shake vigorously for about 2 minutes. Fill the remaining portion of the container and let sit overnight before adding to the aquarium. For best results, drip the supplement slowly into the sump of the aquarium.

  • Can be mixed in a 1-1 Ratio (500ml of each) with Magnesium Sulfate for use as a popular 2-part solution and a stand-alone magnesium supplement.

Recommended magnesium levels are between 1,250 and 1,350 ppm. When not testing, add (10 ml) per 250 gallons weekly.

You will need the following (Not included):

  • 1 new clean food grade container with sealable lid

  • 1 gallon of RO/DI or filtered water.  If you are buying the water, you can also use the jug as your mixing container.

  • Clean plastic funnelMSDS Safety Information For more info on these products, please click here: