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I wouldn't assume that every manufacturer has the same sized and shaped crystals, they don't even all have the same ratios and ingredients, that would be a very rough "roughly". If it's not good enough for cooking/baking (you really shouldn't use volume measures for salt unless you specify the exact kind/ crystal size of salt), then i would think we can do better for reefing tooUse the salinity checkers as a guide its 1/2 cup salt per gallon you can't go wrong should roughly know what you're salinity is going off this