The bucket version of this product has now been discontinued and is only available in a boxed version containing sealed bags of salt inside. Seachems Marine Salt is specifically designed to replicate the saltwater marine environment. It provides every major, minor and trace element necessary. This ensures that even the most delicate marine fish, invertebrates and plants will thrive. Marine Salts enhanced alkalinity ensures a more stable pH than competing salt blends. Marine Salt possesses excellent solubility characteristics and will provide a clear, ready to use solution in only a few minutes. Marine Salt is a convenient and easy to use one-part formula that is ideal for mixing either small or large batches of saltwater. Utilizing state of the art production facilities ensures a consistent and uniform particle size that will not separate in packaging or shipping and will provide a consistent saltwater mix every time. Aquarium Use Only! Keep Away from Children! For Reef environments, use Seachem Reef Salt instead as it is specifically designed to meet the requirements of a reef system. Sizes:200 L (50 gallons), 600 L (160 gallons) DIRECTIONS: 1. Mix Marine Salt with dechlorinated tap or purifed water. We recommend the use of a commercial dechlorinator like Prime to neutralize any tap water chlorine and/or chloramines. This box contains several sealed bags to enable you to use the salt gradually without it going off.