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Old 03-19-2014, 06:29 PM   #11
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I'm using the same instrument to test the mixed incoming water and the current tank water. If the baseline calibration is off, it'll be off for both. What I'm seeing is a relative difference between the two, which indicates it's not a simple calibration issue. That said, I'll check and recalibrate the refractometer, it's always a good idea to have it calibrated.

I'll also run a test to see if the mix duration makes a difference, with my current setup.
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Old 03-19-2014, 11:06 PM   #12
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It sounds like your testing the salinity before it's completely dissolved. I usually get a good reading about 8-10 hours after mixing. I'll make it in the morning, check the salinity that night and do the wc the following day
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Old 03-21-2014, 12:28 AM   #13
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How often does your skimmer gets full? The question sounds unrelated but your salinity gradually goes down every time your skimmer gets full.
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Old 03-21-2014, 07:41 PM   #14
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I thought about the skimmer too, but I only dump out a 1/2 cup every few days.
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Old 03-22-2014, 02:52 PM   #15
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I also use refractometer and lately I have to calibrate it twice in a week. You also need to be aware that the temperature of saltmix will affect the salinity readings. There are refractomers that do not have the temperature compensation feature. I also agree that 1 hr after mixing is not a good idea. The salt will not be evenly distributed and you will get high readings on top even you have circulating pump on your container.
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