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Re: [APD] pH in the filters & root zone (Raj)


         I have two identical tanks one CO2 injected and the other with a 
spraybar. This occurs in both tanks. I have noted a 0.3 - 0.4 increase. On 
water flow, a week later pH returns to normal but the water flow is still 
like new. I continuously monitor pH therefore I notice. I wonder if anyone 
else has observed any change in pH? Probably more due to organic 
decomposition in the filter ?

         Also KH, GH and a whole lot of variable will also play a part.


At 01/09/05, you wrote:
> >         I have noticed that when I unclog my choked (Eheim 2217)
> >canister filter by washing out *only* the first (lowest) layer sponge,
> >the pH rises in the tank. The pH returns back to normal after a week
> >or so.
>By the way.. just how much of a PH difference?
>Cleaning a filter out is doing at least two things... it's increasing the 
>flow of your filter and removing the bacteria from the sponge.
>Nitrification consumes oxygen and creates an acid so the slowing down of 
>this could increase your PH
>But it also (and I'd guess more probable) could be the increased flow of 
>your filter is making you lose more CO2.  Agitated surface water, a 
>wet/dry filter etc will allow CO2 to escape the tank water and that will 
>cause a higher PH, just as adding CO2 lowers PH.   It would return to it's 
>regular level once the filter slowly gets reclogged.

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