A water softener does its quiet work in the basement or the utility room, and nobody thinks about it until the shower feels different or the kettle starts to crust. Its upkeep is less about skill than about routine. The machine needs salt, a clear path for its water to drain, and a person who knows when the salt was last checked. When your father is managing the house alone, that last part is the one most likely to slip.

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What the machine is doing

A softener pulls the minerals out of the water that cause scale on the faucets and film in the tub. It does this with a resin bed that is cleaned from time to time with salt brine. The salt is the fuel. When it runs low, the water goes back to being hard, and the machine can stop regenerating properly. That is usually the first sign something is wrong.

The monthly look

Check the salt level through the window or lid, or by opening the tank the way the manual shows. Keep the salt above the water line but do not pack it to the top. Some salt forms a hard crust that sits above the water and blocks the brine from forming. If you find that, break it up gently with a broom handle or a wooden stick, and be careful not to damage the tank or the float. Keep salt bags off a damp floor, because bags that sit in water go soft and clump.

The drain and the valve

The softener sends its rinse water down a drain line. Make sure the line is still attached, not kinked, and that water flows when the machine runs its cycle. Check that the bypass valve is set to the normal service position. A valve left in bypass sends hard water straight into the house while the machine sits there looking fine.

The clock

Many softeners have a display that shows the time and regeneration schedule. A power outage can reset the clock, and then the machine may regenerate at an odd hour or not at all. After a storm or a power cut, check the clock and set it back if needed.

Who owns the upkeep

Decide who buys the salt, who checks the level, and who calls the service company. Put those three jobs on the same list, on paper, where both of you can see it. Write down the day the salt was last filled, in the notebook by the washer. That one line tells the next person whether the machine has been looked after.

When to call a technician

Call a technician if the water still feels hard after a regeneration, if the tank stays full of water instead of salt, or if the machine makes a sound it has never made before. Have a technician look at the resin and the valve once in a while, as the maker recommends. A service visit is much cheaper than replacing a machine that could have been kept running.

Tonight

Go to the utility room and check the salt level, the drain line, and the valve position. If the salt is low, add it now and write the day in the notebook. If the water looks or tastes different from usual, call the company before the next cycle rather than waiting for a better moment.