Questions for you GHL Pros. Does it matter the length of tubing when doing the calibration. Just got my doser in and is sitting on desk as I getting all connected up. I am about do the calibration of pump heads and was wondering do I need to calibrate with the length of tubing that will be used on the tank or can do it using smaller tubing sitting here on my desk. Hope that makes since. My doser will be 5ft away from the intake and output.