I recently set up the new Vertex "Libra" dosing pumps according to the minimalist instructions on the enclosed CD. Settings are as follows for Alkalinity and Calcium additions: Start time 12:00 AM, end 11:50 PM. Dosing 6.5 mls every 2 hours for 24 hours for a total of 78 ml. Everything seemed okay for a week, but last night pump #2 (calcium) decided to dump almost an entire gallon of calcium into my sump. This happened around 1 AM, and the pump wouldn't stop until I unplugged it. This doesn't make sense! Please advise - did I program the pump incorrectly? If it was alkalinity it would have wiped out my entire system. Fortunately, that pump (#1) seems to be working okay, even though I programmed it the same way. Thanks for any help you can give - Dave