measuring CO2 using CO2-pH-kH relationship chart

[H2SO4]

Hi bros,
Is it true that i can't use the relationship chart to measure CO2 level if i'm adding carbonate powder like oceanfree KH+ to my tank??

[wynx]

Hey...

You certainly can use the KH-pH table to infere the amount of carbon dioxide. Anyhow try to keep your kH between 3-4. The reason why people raise kH in their tank is to prevent the pH of the tank from crashing. Some sort of a buffer. Hope it helps! PM me if you need more help.

[bclee]

As long as you use only carbonate buffers, you can use the charts. Other type of pH buffers will alter the KH-pH-CO2 relationship.

BC