Remove any objects sitting on top of the water softener. It's not a shelf and Culligan warns against storing items on top of the appliance. Excessive weight can lead to leaks.
Examine the hoses leading into the water softener. Tighten any loose connections with a wrench and replace any torn hoses. Wrap duct tape around the hose for a temporary fix if you can't replace the hose immediately.
Examine the pipes above the water softener. If your pipes are leaking, they may drip down on the device, meaning the water softener isn't the actual source of the leak.
Check the top of the tank for cracks in the surface. Replace the tank if it's cracked. The crack is likely to get worse over time and could become a hazard.
Replace the O-rings in the valves if the valves themselves are leaking. Turn the water supply off, unscrew the valve with a wrench, then pop off the old O-ring and push in the replacement.