DI water - The Planted Tank Forum
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post #1 of 4 (permalink) Old 03-17-2016, 10:47 PM Thread Starter
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DI water

my ph meter came in the mail. I have to calibrate in 250 ml of di water with the added buffer that they sent.

DI water? where do I get some. It isn't distilled and the interweb says it's not RO water....(however I have to think RO water would work)

I teach at a HS is my science dept going to have some DI water on hand?

thanks in advance.

North Dakota
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72 bow, mystery snails and angels
55 planted, yellow neon shrimp
55 shrimp tank, rcs
29 shrimp tank, blue- not sure what kind
40 long - winter koi home
40 breeder- planted
10- nursery
10- quarantine
5.5- cycling to be another shrimp tank...
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post #2 of 4 (permalink) Old 03-17-2016, 11:07 PM
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Distilled water, available at any grocery store and almost all pharmacies will work for calibration.


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Last edited by Calestus; 03-17-2016 at 11:10 PM. Reason: N/M
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post #3 of 4 (permalink) Old 03-17-2016, 11:11 PM Thread Starter
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groovy! thank you....

i'm slow, but I'm stupid

North Dakota
125 planted, angels, rummies, c02 tank
72 bow, mystery snails and angels
55 planted, yellow neon shrimp
55 shrimp tank, rcs
29 shrimp tank, blue- not sure what kind
40 long - winter koi home
40 breeder- planted
10- nursery
10- quarantine
5.5- cycling to be another shrimp tank...
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post #4 of 4 (permalink) Old 03-17-2016, 11:52 PM
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DI water - de-ionized: contains no cations or anions (ie Mg2+, Ca2+, Fe3+, Cl-, etc.), can contain uncharged contaminants, won't SNAFU a pH meter calibration

distilled water - re-condensed water vapor: contains very little ions, can contain contaminants with a similar boiling point as H2O

RO water - diffusion through a size-exclusion, semi-permeable membrane: contains slightly more ions and other contaminants in comparison to the other two methods

Honestly, any of these three can be used to calibrate a pH meter; there's no need to be accurate out to the third decimal place with an aquarium.
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