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Old 09-22-2010, 10:53 PM   #1
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Water changes and water containers

Hey guys I have what may seem to be a few questions and unproven theory about water changes and the containers.
You buy mixed water from an extremely reputable LFS. You have your own gallon jugs with lids. You can't do the WC for several ( 4 to 5 )days.
With containers being closed with no air coming in or out, how fast will the water deteriorate?
How low will oxygen levels be since there is no circulation?
Will Alk drop?
Will Ph drop?
Should this mixed salt water be used?
Is there a way to save it?
Juan
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Old 09-23-2010, 12:34 AM   #2
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I use 5g buckets with lids for my freshwater and I've wondered the same thing s out not enough circulation and oxygen. I premake it with all my additive and it sits there for about 5 days. I've started leaving the lid halfway on.
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Old 09-23-2010, 12:37 AM   #3
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The PH will certainly be off with no O2 exchange, alk and other levels shouldn't be too far off. I would open the bucket that you plan to use and drop a small pump in it for several hours to one day to let it remix.
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Old 09-23-2010, 02:40 PM   #4
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This might be something to test out. I suspect that it won't change the levels. Even though there is no O2 exchange because of the lid being on there is nothing in the container using up O2 in the water. Just like carbonation stays in your soda when it isn't opened the oxygen should stay in the water as long as there is nothing consuming it. Granted the container wouldn't be under the same pressure as a can of soda but they concept should be approximately the same.
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Old 09-23-2010, 03:19 PM   #5
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I usually make my own but the reason for my asking is so that I can narrow down the possibility of my recent sps loses.I thought that maybe this might be a reason.
During the summer months I was gone a lot. My roommate feed tank and provided top off water from my RO. Have yet to install Auto Drip system.
When I did a water change , the salt water was store bought in July/August. I ran no tests. Late Aug. did a test and found my alk went from 8dk to 13dk. My Ca went from a steady 460 to 410. I was using Neo Marine and LFS uses IO. Sept WC will be IO.
Just trying to figure out culprit.
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Old 09-23-2010, 03:35 PM   #6
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Quote:
Originally Posted by Ziggy953 View Post
The PH will certainly be off with no O2 exchange, alk and other levels shouldn't be too far off. I would open the bucket that you plan to use and drop a small pump in it for several hours to one day to let it remix.
Completely agree, chances are the pH was way off when you did your water change and the constant swinging around irritated your sps. Pointing a power head straight up with enough surface agitation will make sure your pH stabilizes before you top off. Do a quick test to confirm.

Sometimes when people leave water in large brute containers too long, a weird slime forms in there, do you clean out the container fairly regularly?
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Old 09-23-2010, 03:38 PM   #7
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how about putting an airstone in your container if you cant put a pump in.
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Old 09-24-2010, 12:31 AM   #8
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I typically put all fresh mixed saltwater in a big garbage and run a mag 7.
I just need to stop being lazy and mix my own and test to bring alk, ph, salinity to display tank levels.

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how about putting an airstone in your container if you cant put a pump in.
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Completely agree, chances are the pH was way off when you did your water change and the constant swinging around irritated your sps. Pointing a power head straight up with enough surface agitation will make sure your pH stabilizes before you top off. Do a quick test to confirm.

Sometimes when people leave water in large brute containers too long, a weird slime forms in there, do you clean out the container fairly regularly?
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Old 09-24-2010, 07:04 AM   #9
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when i leave mixed water in my drum for extended periods, i get a calcium build up on the walls of the drum. the calcium levels are dropping and the alk raising.
i run a power head in it also, but i suggest not holding on to mixed water for longer than a couple days if you have corals.
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Old 09-24-2010, 11:34 PM   #10
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I just did a water change. I tested the new salt water:

Mine New
Salinity 1.024 1.025
Alk 10.5 11.5
Ph 8.23 8.12

These all seem to be within acceptable levels. I did just realize that I did not test the fresh mixed water CA. Mine was at 440.

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when i leave mixed water in my drum for extended periods, i get a calcium build up on the walls of the drum. the calcium levels are dropping and the alk raising.
i run a power head in it also, but i suggest not holding on to mixed water for longer than a couple days if you have corals.
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