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Posted by David Cheney on June 8, 2005, 6:39 pm
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Can anyone suggest the best way and ratio to bring the ph back up in my RO
water for water changes and top-offs? I've heard baking soda was good, but
am having trouble finding a soda to gallon ratio that works.
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Posted by Rocco Moretti on June 8, 2005, 7:57 pm
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David Cheney wrote:
> Can anyone suggest the best way and ratio to bring the ph back up in my RO
> water for water changes and top-offs? I've heard baking soda was good, but
> am having trouble finding a soda to gallon ratio that works.
Others here may disagree, but there should be little to no reason to
adjust the pH of the RO water. RO water should be quite pure, so it will
have little to no buffering power - as soon as you mix it with tank
water, the pH of the tank will swamp any pH imbalance of the RO water.
If in doubt, you can always try it. Take a cup of RO water and add a cup
of tank water to it. If the pH of the RO water after mixing isn't that
of the pure tank water, you probably need to check your RO unit. :)
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Posted by Boomer on June 9, 2005, 1:12 pm
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Rocco you are correct, there is no reason
--
Boomer
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Former US Army Bomb Technician (EOD)
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If You See Me Running You Better Catch-Up
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Posted by Mark Roman on June 12, 2005, 7:49 pm
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Rocco Moretti wrote:
> David Cheney wrote:
>
>> Can anyone suggest the best way and ratio to bring the ph back up in
>> my RO water for water changes and top-offs? I've heard baking soda
>> was good, but am having trouble finding a soda to gallon ratio that
>> works.
>
>
> Others here may disagree, but there should be little to no reason to
> adjust the pH of the RO water. RO water should be quite pure, so it will
> have little to no buffering power - as soon as you mix it with tank
> water, the pH of the tank will swamp any pH imbalance of the RO water.
>
> If in doubt, you can always try it. Take a cup of RO water and add a cup
> of tank water to it. If the pH of the RO water after mixing isn't that
> of the pure tank water, you probably need to check your RO unit. :)
You are correct - RO Water has virtually no buffering power. In fact, I
would not even trust a pH measurement obtained on RO water, as accurate
pH measurements require the presence of a sufficient number of ions.
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Posted by Boomer on June 13, 2005, 7:20 pm
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You ^sometimes^ can get an accurate measurement with a pH meter in RO water. You
must
remember, that RO water is a function of the input water TDS. The real issue
with pH, in
pure water, when it is a useless measurement, is when it is RO/DI water
--
Boomer
Want to talk chemistry ? The Reef Chemistry Forum
http://www.reefcentral.com/vbulletin/index.php
WCWing@nospamChartermi.Net
Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS
If You See Me Running You Better Catch-Up
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> water for water changes and top-offs? I've heard baking soda was good, but
> am having trouble finding a soda to gallon ratio that works.