This product is produced by Frank's Tanks, LLC. This is a combination of Magnesium chloride and Magnesium sulfate.

This packages mixes up 1-gallon of Magnesium, which can be manually or automatically dosed into an area of high flow daily, as needed.

Magnesium is an important element we must maintain in our reef aquariums.  Testing weekly is best to know how much needs to be dosed.