My Sears water softener of 6 years cause me problems the other day. Before I went to bed the other night, I turned on the faucet and no water came out. I assumed the city had turned it off because of some problem. The next morning I woke up and found the water still off but I heard the sound of running water. I went to the basement and found several inches of water on the floor and the brine tank running over. Whatever happened caused the filter media to expel all over the floor too. When I read how the system is supposed to work, I can't understand how the house water would ever be shut off or how the media would be washed out of the tank. It would seem to be that the brine tank over filled because the float valve stuck or is damaged. Ideas??