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Old 10-10-2016, 03:05 PM   #21
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Originally Posted by Khuligirl93 View Post
Were you referencing just CO2 produced by the fish then? Sorry just trying to learn something new because I didn't see the op say they were injecting CO2 but then there was talk of CO2 off gassing.

OP also did not specify which time of day they were testing pH.
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I didn't reference anything ☺️.

Because tap water (cold especially) is under pressure and cool it holds more co2. I think some treatment facilities add co2 to reduce the pH after performing tasks that significantly increase it. So if you fill a cup with tap water it takes time for the co2 to 'gass off' thus as the co2 begins to reach atmospheric equilibrium the ph will rise (co2 dissolved in water forms carbonic acid H2CO3 and removal of this acid raises the pH)

Hope this helps.


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Old 10-10-2016, 03:11 PM   #22
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And wouldn't adding excel cause plants to absorb the carbon and then off gas it after the photoperiod? There for that would have to have an effect on the ph?

Not sure on this but it's a thought


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Old 10-10-2016, 03:23 PM   #23
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And wouldn't adding excel cause plants to absorb the carbon and then off gas it after the photoperiod? There for that would have to have an effect on the ph?

Not sure on this but it's a thought


30g planted, 90g Oscar tank

If that's how liquid carbon works it may increase how fast it is used up but the principles behind liquid co2 are still purely speculative at this stage.


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Old 10-10-2016, 03:39 PM   #24
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Originally Posted by Caliban07 View Post
I didn't reference anything ☺️.

Because tap water (cold especially) is under pressure and cool it holds more co2. I think some treatment facilities add co2 to reduce the pH after performing tasks that significantly increase it. So if you fill a cup with tap water it takes time for the co2 to 'gass off' thus as the co2 begins to reach atmospheric equilibrium the ph will rise (co2 dissolved in water forms carbonic acid H2CO3 and removal of this acid raises the pH)

Hope this helps.


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Huh, interesting. In my experience, tap water comes out of the sink at a very high pH (9+) and lowers after letting it sit overnight. I've never heard of it containing CO2 before. Maybe depends on the municipality?


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Old 10-10-2016, 04:12 PM   #25
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pH level rising

Quote:
Originally Posted by Khuligirl93 View Post
Huh, interesting. In my experience, tap water comes out of the sink at a very high pH (9+) and lowers after letting it sit overnight. I've never heard of it containing CO2 before. Maybe depends on the municipality?


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Well it just holds more co2 because of Henrys law https://en.m.wikipedia.org/wiki/Henry%27s_law

Tap water does vary in co2 depending on the municipality.

See here post numbers 10&12

http://www.barrreport.com/forum/barr...-an-experiment

Edit: perhaps as you may have low co2 in tap water, it is entering the water from the atmosphere to achieve equilibrium and lowering the ph.

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Old 10-10-2016, 04:32 PM   #26
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I must say this topic has had a lot of interesting info on it. Some really good reading here but I don't think we have found an answer yet


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Old 10-10-2016, 06:17 PM   #27
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I must say this topic has had a lot of interesting info on it. Some really good reading here but I don't think we have found an answer yet


30g planted, 90g Oscar tank

We are still kind of on topic ☺️I think what Gemach alluded to earlier regarding 'off gassing' of co2 is most likely.


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