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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?
 

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i'm not sure if I can be much help but I imagine you would want to treat this as if you would any tank. For cooking rock, consistency is probably more important than having a specific specific gravity.:funny:

Though as you continue to cook the rock you should be upping the salinity as you would with any tank.
 

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Jeremy, after all of the salt mix has disolved and you've got 5 minutes of mix time, I am gonna say its "dead on balls accurate".

Here is how I can back that up. When I was doing the Hypo, I was mixing water and checking it constantly. I'm being 100% honest when I say there were times when the water was only mixed for a few minutes before it went into the tank. I would figure my salt to water ratio using a calculator. So I knew exactly what SG I was making. The refractometer always agreed.
 

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I think it is hardly going to matter now. The heater went bonkers in there last night and it feels like about 85 degrees. SUch a rapid change probably did more damage than the salinity swing would have to my bacteria. I'm going to let it slowly cool off and then do my water change. Hopefully the bacteria are not starting completely over.
 
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