We have a Culligan Mark 59 Aqua Sensor water softener system. It runs once a day at 530 in the morning. When we get up and use our water the unit (the box on top with all the controls) shakes considerably and makes a very loud noise throughout the house. Once we have run some water for a little while it stops and we don't notice it throughout the day. We have company coming soon and are hoping to solve this problem before they arrive (the unit is in a room right next to where they will be sleeping). Any thoughts on what may be causing this? Kristin