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Old 02-01-2012, 08:46 PM   #1
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After u do a water change how long should u wait to check the SG? Mine before was 1.020
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Old 02-02-2012, 07:48 AM   #2
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You should check the salinity of the new water before it's added to the tank and it should match what's in the tank unless your trying to raise or lower the tank salinity. But anyway, you can check it a few minutes after you finish the water change. 1.020 is way too low. Should be 1.026.
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Old 02-02-2012, 09:38 AM   #3
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I knew was too low Thats y wanted do water change ... I didn't check it after bc didn't know and forgot this morning but it's always been at 1.024 since its been running.... I'll check as soon as get home and see if it went back up
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Old 02-02-2012, 09:46 AM   #4
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You should check the salinity of the new water before it's added to the tank and it should match what's in the tank unless your trying to raise or lower the tank salinity. But anyway, you can check it a few minutes after you finish the water change. 1.020 is way too low. Should be 1.026.
I don't think you'd get an accurate reading after "only a couple" minutes after the PWC. I wait at least an hour before rechecking salinity and then adjust. I keep mine between .024 and .025
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Old 02-02-2012, 02:13 PM   #5
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I keep mine at .023 and that seems fine, is this too low?
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Old 02-02-2012, 02:15 PM   #6
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I agree. I would wait a couple hours after you just mixed the saltwater to test the salinity. Checking right after you've added the salt won't be very accurate I would think.
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Old 02-02-2012, 03:10 PM   #7
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I agree. I would wait a couple hours after you just mixed the saltwater to test the salinity. Checking right after you've added the salt won't be very accurate I would think.
I was actually referring to after you put the water in the tank and then test the tanks salinity.

As far as mixing the actual water to be used in pwc....I drop a couple powerheads in the bucket and let it mix for 24hrs. I definitely wouldn't mix water and then use it after only a couple minutes or even 1 hour. All the salt wouldn't be dissolved and your reading would more than likely be low.
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Old 02-02-2012, 03:11 PM   #8
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Oh yeah, that too.
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Old 02-02-2012, 05:27 PM   #9
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I buy my water pre-made from my LFS
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Old 02-02-2012, 06:20 PM   #10
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Ok, so here's my understanding of the situation. If you check the SG right after mixing new water, you can get a false high reading because of bubbles from the mixing. A couple hours will probably sort that out. After adding the newly mixed water to the dt, I always wait an hour to be sure it's been thoroughly mixed into the tank's water, though I'm probably being conservative. With good flow, it should be mixed in pretty quickly.
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