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Old 09-23-2009, 07:47 PM   #11
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Yes, that's true, because they are made to measure saline solutions (brine/saltwater) and using RO water will properly calibrate it for a saline solution. We use seawater in our tanks...it's a different beast.
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Old 09-23-2009, 11:38 PM   #12
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Well then, would my salinity be incorrect right now? And would it be off by one point? And if so.. then everytime i measure the salinity, should i subtract or add that extra point that you stated before? Or am i getting in to a whole new ballgame with those questions..
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Old 09-23-2009, 11:46 PM   #13
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I quit with refract. and hydrometers.
I just dip my finger in the tank and taste it
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Old 09-24-2009, 12:12 AM   #14
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Quote:
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Well then, would my salinity be incorrect right now? And would it be off by one point? And if so.. then everytime i measure the salinity, should i subtract or add that extra point that you stated before? Or am i getting in to a whole new ballgame with those questions..
If you calibrated with RO, you are off by aprox 5%. If you want to be at 35 ppt and you calibrate with RO, your refracto should read ~37 ppt. If you are showing 35 ppt, you are actually at ~33.3.

From the article I linked to...
A 35 ppt sodium chloride solution (3.5 weight percent sodium chloride in water) has the same refractive index as a 33.3 ppt seawater solution, so the error in using a perfectly calibrated salt refractometer is about 1.7 ppt, or 5% of the total salinity.
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Old 09-24-2009, 12:30 AM   #15
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Alrighty then. Thanks for that clear up. Guess i will have to take that in to consideration from now on whenever testing the tank and my PWC water..
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Old 09-24-2009, 03:35 PM   #16
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I use RO to calibrate my refracto. I rinse with RO water then wipe dry. If you use the same refracto and get the same reading everytime you mix your salt...IMO that is close enough. It's a drastic change in SG that will kill your fish and corals. That and temp variations.
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Old 09-24-2009, 08:43 PM   #17
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Quote:
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If you calibrated with RO, you are off by aprox 5%. If you want to be at 35 ppt and you calibrate with RO, your refracto should read ~37 ppt. If you are showing 35 ppt, you are actually at ~33.3.

From the article I linked to...
A 35 ppt sodium chloride solution (3.5 weight percent sodium chloride in water) has the same refractive index as a 33.3 ppt seawater solution, so the error in using a perfectly calibrated salt refractometer is about 1.7 ppt, or 5% of the total salinity.
Good info from Cccapt here. until a couple weeks ago I only calibrated with RO/DI water. When I purchased the calibration solution it showed that the RO/DI was off. I thought I was at 1.025 but I was really at 1.022! I think my sps coral will appreciate 1.025 much more than the low salinity I had them in. I am now in the process of raising it up to a "more accurate" 1.025.
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Old 09-24-2009, 08:55 PM   #18
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What is more important? SG or salinity? What would be an optimal salinity level?
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Old 09-24-2009, 09:53 PM   #19
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What is more important? SG or salinity? What would be an optimal salinity level?
Basically they are different ways of measuring the same thing. I like salinity around 35ppt which is a SG of around 1.026
As far as what is optimal, it depends on what you have in your tank and that will help determine what is optimal for you.
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Old 09-24-2009, 10:03 PM   #20
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+1 ryshark.

Most sites that i have visited that sell livestock, say anywhere from 1.022-1.025. And that's a pretty good boundary for livestock.
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