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Re: [APD] CO2 and pH control

I just retested with the same results. However, I'm using the Aquarium 
Pharmiceuticals test and I'm unclear whether you count the first drop 
which changes the solution blue. After color change to blue, it takes 9 
drops to turn yellow. If you count the first drop, the KH is 10. Does 
that make more sense?


Jerry Baker wrote:

>Gordon and Susan Watkins wrote:
>>Thanks for the info Jerry. My KH and GH both measure 9.0. From your 
>>info, it sounds like my current level of 8.2 is about right.
>Only 9? And your pH is 9.3? That means there is something else in that 
>water acting on your pH other than carbonates and CO2. Your water should 
>have a pH around 7.7 - 8.0 if the KH is 9.
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