Every softener that uses resin recharges itself, a process called regeneration. At a set point, the control flushes the resin tank and draws brine from the salt tank to refresh the beads. While that happens, the unit uses water and sends wastewater down the drain. How often it runs and what time of day it starts are often left to a factory default or an installer's habit, not to the homeowner. Those two settings decide whether the cycle lands on a quiet hour or in the middle of your morning shower.
Find out what sets the cycle
Ask whether the unit regenerates on a clock schedule, on measured water use, or on a combination of both. A clock-based unit runs at the chosen hour whether or not much water was used that day. A demand-based unit waits until the resin has done a set amount of work before it starts. Either can be a good fit, but they behave differently in a house with a guest room, a vacation schedule, or people who shower at odd hours. Ask the installer which type the quoted unit uses and where that setting lives on the control head.
Pick the start time around your own week
Write down the hours when water use peaks in your home: morning showers, laundry, dishwasher runs, and any irrigation or pump activity. Then ask what time the cycle is set to start and whether you can move it. Ask the installer to change it during the visit and show you the steps, so you are not relying on a sticky note. Ask whether the unit waits if water is running when a cycle is due, and ask what it does if someone draws water during a cycle. Get the answers in writing, not just spoken.
Ask how long a cycle runs and where the water goes
Ask how long a regeneration cycle takes on this model with this resin volume, and whether the drain line is sized for the flow during that stretch. A shared drain with a utility sink, a washing machine, or a floor drain nearby deserves a direct question. If the wastewater goes to a standpipe, ask whether the standpipe height and the air gap match the cycle. These details come from the installation, so the answers belong in the install paperwork.
Check the noise and the placement
Ask how loud the unit is during regeneration and whether it sits against a bedroom wall. A softener in a utility room with a thin shared wall can be heard at night even when it is working as it should. If the answer is that the room will be loud at the scheduled hour, change the start time or the placement before the job, not after.
Get the setting on paper
Before you sign, ask that the quote or install sheet list the regeneration start time, the trigger type, and who changes it later. After the install, have the technician show you the display and the reset steps. Keep that sheet with your warranty papers. When you call for service, one of the first questions is often what time the unit runs, and the sheet answers it without a visit.
If you are still comparing companies, the rankings of St. Louis water softener companies can help you build a shortlist, and the rating method shows what each review looks at.