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Re: [APD] CO2 Measurement Method

I believe Vaughn Hopkins wrote this email section below:
> I have a cork wall in my 29 gallon tank.  I also have been measuring 
> 150 - 250 ppm CO2 using PH/KH table.  Being somewhat dim witted it has 
> taken far too long for me to connect those two facts.  Apparently cork 
> leaches tannins into the water which drops the PH a bit, making the 
> PH/KH/CO2 table inaccurate.  Today I checked a water sample taken from 
> the tank last night and allowed to sit over night vs. one taken this 
> morning.  Last nights sample had KH of 9 degrees, PH of 7.0 - 27 ppm 
> CO2.  Todays fresh sample had KH of 9 degrees and PH of 6.2 - 170 ppm 
> CO2.    I think this strongly indicates that the cork is fouling up the 
> CO2 measurement.   But, the .8 drop in PH should mean my actual CO2 is 
> about 25 - 30 ppm, which the fish and plant reactions say it should be. 
>   Any comments?

Hmm I wonder if the same is true of my 3 bits of bog wood I've got in my tank?

I've been wondering why my CO2 level seemed low.

I'll do what you did.


Stuart Halliday
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