I have the new Dr. Bridge KH Guardian monitor. It's been running for a couple of weeks now and still tuning things. However I am seeing that my Alk is dropping at night. Not really sure why yet. I dose once every 3 hours now. I may have to adjust the program to dose more at night. I wonder if it has anything to do with the calcium uptake being less at night? At least that is what I think is supposed to happen.