Yes it's USP grade Magnesium Sulfate same or even a higher grade then sold in fish stores. Best to use the proper mix of 5 cups Mag Chloride and 3 cups Mag Sulfate for 1 gallon RODI water when dosing though. This is so that you don't build up excess sulfate in your tank from strictly dosing Mag Sulfate.
Last edited by dcw1sfu; 04-01-2016 at 08:41 PM.
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