This product has a 12 month shelf life.DirectionsBest results when used as follows:Use a minimum of one lb. Bio-Activ Live Aragonite reef substrate per gallon of salt water.Set up filtering system and allow it to circulate.During the first month introduce no more than one inch of fish per five gallon salt water.
Nature's Ocean Bio-Activ Live Aragonite Reef Substrate
Size: 16 lbs.