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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.
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