This product is produced by Frank's Tanks, LLC. This is Sodium bi-carbonate, aka Soda Ash.

This pouch mixes up to 1-gallon of Alkalinity. This is part of 2-part dosing, and can be added manually or automatically on a daily basis.

Alkalinity is critical to maintaining a successful reef tank, and measuring alkalinity often is best. At the very least, test weekly. Some test daily since alkalinity is that important for livestock.