more flow= higher ph? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 05-02-2008, 01:56 AM Thread Starter
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more flow= higher ph?

I forgot where I read somewhere that someone mentioned that with increase flow in the tank the PH increases....

is this true?

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post #2 of 6 (permalink) Old 05-02-2008, 05:09 AM
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It is possible that if you are injecting CO2 (which will lower the pH), that excessive surface agitation (that might be caused by increased flow) could off-gas the CO2, thereby increasing the pH.

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post #3 of 6 (permalink) Old 05-02-2008, 01:27 PM
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Quote:
Originally Posted by Luichenwai View Post
I forgot where I read somewhere that someone mentioned that with increase flow in the tank the PH increases....

is this true?
Never heard that one before. It's possible depending on certain media in your filtration I guess, but by just upping the flow rate I don't see how.

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post #4 of 6 (permalink) Old 05-02-2008, 02:19 PM
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I suppose it's possible. I don't understand it fully but if protonation can occur when enough water to air contact is made it could cause a change in pH, I think. I'm no chemistry expert but I'm willing to bet this sort of thing is so miniscule in the difference it makes and therefore won't have any effect on us whatsoever.
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post #5 of 6 (permalink) Old 05-02-2008, 02:28 PM Thread Starter
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I mean, I dont run CO2 in the tank. With the tap water sitting overnight the ph is still around 7.0. I think I'll be ok.

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post #6 of 6 (permalink) Old 05-02-2008, 08:06 PM
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Simply adding more flow will have nothing to do with pH. Gas exchange could effect pH, so if the flow increases gas exchange(via surface agitation or any other method) then pH could change....but it would be due to gas exchange, not flow.
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