Aquarium Systems Instant Ocean is a synthetic sea salt from high quality for use in aquaria. Free of nitrates and phosphates. Since 1964, Aquarium Systems Instant Ocean is the most carefully formulated and manufactured sea salt in the world. An extensive biological and scientific programm, particularly with the scientific community and in the Aquarium Systems hatchery -where they have produced millions of tropical sea fish- has enabled them to elaborate and refine a formula that fulfits the needs of capative marine organisms. Each ingredient used in the composition of Instant Ocean is carefully selected and tested. Each batch is analysed in order to guarantee that all important elements have been perfectly mixed. Each batch is also continously monitored in laboraty aquatic systems containing delicate marine animals and plants, because live organisms are always the most sensitive indicators of quality.Aquarium Systems Instant Ocean Element levels at different salinities:1020: Calcium: 3