On 7/19/2016 at 10:50 AM, Anna N said:
My reservoir was nearly empty so I unscrewed the knob out of curiosity. The water that drained out contained lots of mineral particulates. I continued to let it drain until it seemed clear. Think I'll try to remember to do this periodically. Additionally, when I had a leakage problem before it was due to the drainage tray not being properly seated in its grooves.