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Old 05-09-2004, 05:52 PM   #1
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RO vs saltwater for storing

I'm going to store some water for emergencies in a tightly sealed plastic container.

Given the choice, would storing just RO water, or pre-mixed saltwater be better for storing for a couple of months?

Storing the saltwater would mean I could use the water a few hours sooner than if it had to be mixed - but would normal RO water keep better?
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Old 05-09-2004, 06:51 PM   #2
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More than likely the straight RO water would be the saferst, IMO. You would not have to worry about impacting SG with evaporation, or ph impact from sitting.
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Old 05-09-2004, 07:28 PM   #3
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Cool, thanks

On a similar point - I mix the salt with my RO water for at least a day, then leave it for a couple of days (with a lid covering it), then when I go back to it it's often got little white debris bits in it - not sure what they are - any ideas?
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Old 05-09-2004, 07:35 PM   #4
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probably calcium or magnesium precipitation.
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Old 05-09-2004, 07:51 PM   #5
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I thought I was getting all those out with my RO unit? :p

As they're in the water anyway, I guess if a bit gets into the main tank during the waterchange, it's not a problem?
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Old 05-09-2004, 10:50 PM   #6
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Well, if it's a reef tank your adding water that is imbalanced which could throw off the balance of the tank. The salt mix has CA and MG in it
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Old 05-10-2004, 12:37 AM   #7
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When I first got started in SW I stored my mixed water in what I thought was a tightly sealed container. After a water change I lost 3 fish. Being a noob a waited a couple of weeks and added more fish and used water out of the same container for the next water change. Of course I lost all my fish again.
My container wasnt sealed and I was killing my fish with bacteria from the stored SW. Since that I NEVER store SW for more than a few days without using it.

Im not the sharpest tack in the box, so my experience wouldnt necessarily apply to you.
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Old 05-10-2004, 04:17 PM   #8
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Thanks for the input guys - I guess I'll store RO water, rather than mixed saltwater, then
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