... most essential for saltwater aquarium systems. Therefore, these elements should be considered when choosing a a sea salt mix to buy for making up aquarium water. Note that values obtained from different sources vary, as values can change from test to test for different reasons, but for the most part these values reflect the overall average measurements from various resources referenced to formulate this table.
References: Periodic Table of Elements from Faculty of Chemical Technology, Croatia, Periodic Table of Elements with Seawater Additions by Pat Wilde, Periodic Table of Elements from WebElements, and other Sea Water Composition & Salt Mix Resources - Books: "The Marine Aquarium Handbook" by Martin A. Moe, Jr., and "The New Marine Aquarium" by Michael S. Paletta.
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Salt Mixes - Part 1: What to Look For When Choosing a Mix
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Salt Mixes - Part 2: Which Brand is the Best to Buy?