Pop open the top lid. You’ll likely find a distributor tube stuck in the middle—it looks like a plastic straw for giants. Wiggle it out gently, or curse like a sailor when it won’t budge. Then dump the water out of the brine tank (the big plastic drum that smells vaguely of pickles). You’ll see a layer of sludge at the bottom. That’s your enemy. Laugh at it. Then scoop it out with your sponge or shop vac. This is the messiest, most satisfying part.
DIY Water Softener Maintenance Culligan - YouTube