undbulsu
Aquarium Advice Apprentice
In other words, you have a sample of water and measure the kH and pH. Let's say you get a value for the pH of 7.0 and a kH of 3.0. You then inject CO2 to bring the pH down to 6.5. Will the measured kH change along with pH? If so, in figuring out the CO2 levels in you tank, should you use a sample that has been resting out of the tank for a while to measure kH or one directly from the tank? Does it make a difference?