Thursday 17th October 2013: 4.07pm. Descaled the espresso machine yesterday as I do every three months, and was amazed at the clumps (crystals even) of limescale which had accumulated in the water tank, inlet filter, and everywhere else. Twelve hours of being soaked in concentrated lemon juice later, and it's much better if not entirely clear. Similarly, I replaced the water filter for the fridge and was surprised how much it improved the rate of flow. Obviously Summer in Waterloo Ontario is a time of much more minerals in the tap water!