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How long after adding salt to a batch of SW will a refracto give an accurate reading? I poured some RO/DI in to empty a jug and have to readjust the salinity. Its not for my tank its for cooking rock but I don't want to shock the bacteria in the rock. WOuld the caustic nature of freshly mixed in salt still affect bacteria even moving from 1.016 to 1.024?