DI Water?
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DI Water?

This is a discussion on DI Water? within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; --> I was wondering if the de-ionized water that my school's chem department produces would be suitable for aquarium use. They run the water through ...

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Old 10-04-2010, 06:51 PM   #1
 
DI Water?

I was wondering if the de-ionized water that my school's chem department produces would be suitable for aquarium use. They run the water through some special solid plastics that attract the ions in the water. It's mostly used as the solvent in aqueous solutions, so it should be chemically pure H2O.

I was just wondering because it's free for me to use as a student, which is more than I can say for the overpriced R/O water in town.
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Old 10-04-2010, 11:16 PM   #2
 
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Honestly it depends on what type of fish you are going to stock in your tank. While pure H20 is great in that it doesn't have nasty chemicals in it there's a bit more to it. Depending on your fish that you would like to stock, some fish like hard water while others like soft water. If you were to go with a simple platy they wouldn't do so hot in the water you are suggesting.

what makes water hard or soft is the mineral deposits. Also before actually stocking your tank is the nitrogen cycle. Be sure to cycle your tank and do daily water testing.
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Old 10-04-2010, 11:27 PM   #3
 
My tank is cycled. I borrowed gravel and the filter pad from another tank (I made sure they never dried out). It's been running for almost a month now with some harlequin rasboras. I'm planning on housing a breeding pair of rams in the tank and need to lower the pH and hardness. Tap water around here has a pH of 7.8 and moderate hardness, which is higher than most sites suggest. DI water should help bring the pH and hardness down if I do a 50/50 mix of DI and tap water.

My concern with the DI water is simply that I've never used it before and was wondering if it was safe to use. It's filtered with chemicals, so I'm not sure.
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Old 10-04-2010, 11:31 PM   #4
 
Pure RO water is not good for fish, at least not 100% which is why we mix it. Fish due depend on those trace minerals in the water and pure water will effect their osmosis, which is a process all living cells have. In pure water they will be under the constant infux of water into their cells which must be pumped back out. To maintain the proper balance, thus requiring more energy then if they were in impure water. Osmosis seeks to balance out the concentration of solutes "stuff" in the water and in the cells.

DI water I am unsure about it is deionized, meaning no charged ions exists in it. It is not pure water though....

BTW your tap water is perfectly fine as is for the vast majority of fish.
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Old 10-04-2010, 11:38 PM   #5
 
It should have 0 hardness though, right? Hardness is due to the dissolved ions, and the water is de-ionized. If I can lower the hardness of the water with a 50/50 mix of tap and DI water, the pH should also decrease because the buffering capacity of the water decreased. At least, that's my theory. I haven't had to deal with hard water and high pH before because the tap at my old place was just about 7.0 with a relatively low hardness.
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Old 10-04-2010, 11:49 PM   #6
 
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Originally Posted by mozart531 View Post
It should have 0 hardness though, right? Hardness is due to the dissolved ions, and the water is de-ionized. If I can lower the hardness of the water with a 50/50 mix of tap and DI water, the pH should also decrease because the buffering capacity of the water decreased. At least, that's my theory. I haven't had to deal with hard water and high pH before because the tap at my old place was just about 7.0 with a relatively low hardness.
Hardness is a buffering system though... its not all ions all the time. Though in theory as you remove the ions the buffer should for more ions until it is depleted or reduced considerably. Simple test on the DI water should tell you wants in it. But like I said their is nothing wrong with your current water. I use straight well water w/ ph of 7.6 and it is moderately hard. I unintentionally spawned locally bred GBR in it before and that water was two weeks old.
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Old 10-04-2010, 11:56 PM   #7
 
Maybe DI water isn't needed then. Thanks for the help
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