90% saturation at what temp? As I understand and please correct me if I am wrong water saturates at a different level depending on temperature. So 90% saturation at 68F would be around 9ppm? I cannot measure that as I haven't the equipment but just want to be sure I am understanding.
Yeah you are correct. You are over thinking this. I gave my air equation in my rdwc guide. If you use that amount of air, you will be fine from 65F - 80F. Ive tested these rates in the low 90s with success.