From Bulk Reef Supply....
<span style="color: black"><span style="font-size: 12px">Saltwater Correct High Purity Zero Ammonia Magnesium Chloride Supplement is a concentrated salt that is designed to restore low levels of magnesium with minimal impact to the ionic ratios found in natural seawater. It’s highly recommended to use Saltwater Correct Magnesium Sulfate in conjunction with Saltwater Correct Magnesium Chloride in order to get close to natural seawater ratio. When dosing both use 50% of each. </span></span>