Does water polishing affect the dissolved oxygen content of water?

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jpappy789

Plants need meat too
Feb 18, 2007
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I can't imagine any reason why they would since it's a dissolved gas and not a solid, plus if the outflow is placed near the surface you'll be creating enough agitation for gas exchange. What type of media are you worried about?
 

authmal

Pseudonovice
Aug 4, 2011
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There wouldn't seem for there to be any place for the oxygen to go. However, just having a canister filter can lower the oxygen levels in the water, since it's possible to orient the return to prevent surface agitation, which decreases gas exchange.
 

Slappy*McFish

Global Moderator
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Feb 18, 2002
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Not directly. If anything, they increase redox by polishing the water. As authemal stated, they can potentially prevent surface oxygenation if no other means of aeration/surface agitation is incorporated. This may or may not even be an issue depending on the specific O2 demands of the tank in question.
 
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