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Old 07-26-2008, 10:08 AM   #11
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IMO, 29 or 30 dKH in saltwater is impossible. All the carbonate, most likely sodium carbonate since we are talking alk, would precipitate out of the water. You would have a blizzard in your tank from the super saturation and after the precipitation settled, your alk reading would be very, very low.

I will also add that many corals start to "burn" with alk readings of 12 dKH and above.
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Old 07-26-2008, 02:55 PM   #12
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Well as for the salt not dissolving all the way that is a minor issue. No worries there....

The 29dKH however is a problem. Since you haven't put anything in the tank yet I would wait for sure! Test your tank water for dKH and see what you get. If it is off the charts then you have an issue. I would strongly recommend getting RO/DI water or buying an RO/DI unit and use it. If your water is that hard out of the tap then you would do well to not use straight tap water!

dKH in my system is 9, just tested it this morning....
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Old 07-26-2008, 05:56 PM   #13
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Originally Posted by cccapt View Post
IMO, 29 or 30 dKH in saltwater is impossible. All the carbonate, most likely sodium carbonate since we are talking alk, would precipitate out of the water. You would have a blizzard in your tank from the super saturation and after the precipitation settled, your alk reading would be very, very low.
I was thinking it was impossible also, but heck... those API tests are pretty foolproof and I don't thing anything goes "bad" in the alkalinity test, do they?

I was also wondering if the white stuff that didn't dissolve was the residue from the "snowstorm", but like you said then the alkalinity would be very low.

Is there something in the water that the alkalinity test could be "reading" as carbonate hardness? In other words... even though the test says it's 30, in reality it's more like 8 or something? I'm not a chemist so I'm not sure how those tests work.
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