I just did a API pH test on my tank, and the water I premix with 50/50 RO/Tap. Was interesting to see how big difference the CO2 made with a very high KH (10) The Tank tested 7.2 and the premix water tested 8.2 Just show's you how easy you can have a pH crash if you don't have a high enough buffer in your water. So I guess my water have around 20 - 30ppm of CO2 in it? Cheers Izak
