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I always see people have these things attached to the outflow of the filter, but would having in on the inflow to filter increase diffusion or would this create a problem.
 

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People have done it, how ever they say the co2 eats the plastic on the pumps parts. Which if its dissolved into the water column I don't see the difference. I have mine on the out flow I was more worried of creating an air pocket in my canister
 

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I've just temporarily hooked mine up to the inflow on a Maxijet 900 power head while I await an external pump (it's the water flow I'm trying to improve). I used to have it on the outflow of my Ehiem 2213. I notice that I have much smaller micro bubbles now than I had. That is likely due to a combination of having it on the inflow and in a larger flow rate. I will definitely be placing it into the inflow on the pump as I am convinced the additional agitation produced by the impeller assists in the absorption rate.
 
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