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Re: [APD] Estimative Index for CO Dosing - Bah!

This intrigues me.  I'm going to get out the kits again and try to see 
if I can apply this.  So, if I let a tank sample of water sit 
overnight, test the PH, and from that, figure the KH assuming 4 ppm of 
CO2 is in the water, that will be the true carbonate contribution to 
the KH, and the KH I should use with the tables to determine my CO2 ppm 
from a tank sample taken during the day?  Assuming this is accurate 
enough why wouldn't this be the preferable way to check CO2 all of the  
time?  I would certainly prefer to know my CO2 level more accurately 
than by using the fish misery test.

That suggests to me that the KH/PH/CO2 table can be changed to a PH 
overnight/PH during the day/CO2 table, and not even have to measure KH 
except to make sure it is high enough to avoid PH crashes.

Vaughn H.

On Wednesday, March 8, 2006, at 09:30 AM, Jerry Baker wrote:

> For instance, say your KH test says your water is 5 degrees, but when
> you let your water sit out overnight the pH is 7.3. That means that 
> your
> KH is really about 3 degrees and 2 of those degrees reported by your
> test kit are sources of alkalinity other than carbonates. For figuring
> CO2, just use 3 from then on (until you change something).

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