Almost every water softener diagram shows the same picture: a tall resin tank with a control valve on top, a shorter brine tank beside it, and arrows tracing two different flow paths through them. Learn those two paths, service and regeneration, and any manufacturer's drawing becomes readable, whichever brand of valve is sitting on top.
Follow the arrows: the service path
Hard water enters the control valve, is directed down the outside of the riser tube and travels through the resin bed from top to bottom. Hardness, which the USGS describes as dissolved calcium and magnesium, sticks to the resin beads while sodium is released in exchange. The softened water reaches the bottom distributor, rises up the inside of the riser tube and leaves through the outlet port of the same valve. That is why the inlet and the outlet sit side by side on one head in the drawing.
Follow the arrows: regeneration
When the meter or the timer calls for it, the valve rotates and the arrows reverse. Backwash sends water up through the bed to lift and rinse away the accumulated grit. Brine draw pulls concentrated salt solution from the brine tank through an injector and down through the resin, where sodium displaces the captured calcium and magnesium. A slow rinse pushes the brine through, a fast rinse settles and packs the bed, and finally the valve refills the brine tank with water so salt can dissolve ready for next time.
The parts a diagram labels, and what each is for
The bypass valve at the back lets you isolate the unit without cutting water to the house. The control valve holds the meter, the timer and the internal piston. The riser tube with its lower distributor basket carries treated water back up. Beneath the resin sits a gravel underbed in many designs. In the brine tank you will find the salt, the brine well, the float and safety shutoff, and the air check that stops the unit sucking air. Our water softener cost guide covers what these assemblies are quoted at.
Questions people ask about how does a water softener work diagram
Which way does water flow through the resin during service?
Downwards, from the top of the tank through the bed, then up the riser tube in the center and out through the valve. Backwash reverses that direction.
What does the brine tank do between regenerations?
It holds salt sitting in water so that a saturated brine solution is ready. The unit only draws from it during the brine step, not during normal service.
Why do some diagrams show two resin tanks?
Those are twin-tank systems. One tank stays in service while the other regenerates, so the house never receives untreated hard water during the cycle.