Precision Salt Blend for Reef Aquaria Overview Extensively-researched and tested over a multi-year period, with a formulation based on current understanding of Marine Chemistry and Marine Biology as they pertain to the husbandry of all marine aquaria. Precision-formulated to replicate the natural seawater ratios of every major element, as well as all non-conservative minor and trace elements. 134 g per 1 US-gallon (3.785 L) of purified water yields a specific gravity of ~1.025 g/cm3, with a pH of ~8.30 and alkalinity of ~7.5 dKH. Manufactured by Brightwell Aquatics in our production facility (not outsourced) under the strictest standards of quality. Every batch is lot numbered and sampled for quality control. Utilizes a production process that promotes particle size uniformity and a dry blend.