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Old 07-18-2003, 04:49 PM   #1
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Refractometer vs. Hydrometer

I just purchased a refractometer and calibrated it. I've discovered my hydrometer was reading low. Hyrdrometer reading 1.025 sg. and the refractometer reads 1.028 sg. How slowly should I bring my sg down to my target of 1.025? Several hours or a couple of days???
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Old 07-18-2003, 04:54 PM   #2
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1.028 isn't that far off from your target.. I would say just mix your water for your next water chang at 1.025 and you'll be mixing 1.028 with 1.025 and you'll end up somewhere in the middle. Do the same for the next water change after that and so on, you'll bring it back to normal nice and slow with no additional effort really.
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Old 07-18-2003, 05:06 PM   #3
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Same exact thing happened to us when we first bought our refractometer. If you sure your refractometer is calibrated correctly, I'd go with BillyZ's suggestion. You can always go one step further and mix your water change water to 1.024, but I wouldn't do anything more 'drastic' than that.
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Old 07-18-2003, 06:13 PM   #4
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Quote:
Originally Posted by ReefLady
If you sure your refractometer is calibrated correctly

I've double checked the calibration using distilled water as directed so hopefully its correct.
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