A softener that is plumbed in and running is not the same as a softener that is set up correctly. Most of what decides whether the unit treats your water well happens in the first hour after installation or after a service visit, when the control settings get entered and the first regeneration runs. This guide walks through that commissioning step so you can confirm it before the technician leaves.
Ask for the settings sheet before anything is switched on
Ask the technician for a written record of every value entered into the control. A verbal "it's set up" does not tell you much. The record should show the hardness value programmed, the regeneration method (on demand by water use, or on a fixed schedule), the salt dose setting, the current time on the clock, and the regeneration start time. Ask where the hardness value came from. It should trace back to your own water test, a utility report for your supply, or a test done at your tap that day. A number copied from a neighbor's house is not a basis for the setting. Keep the sheet, and tape a copy near the unit if the manufacturer's instructions allow it.
Check the clock before you check anything else
Many softener problems start with the clock. If the time of day is wrong, a regeneration that was meant to run overnight can run in the middle of your morning shower, and a unit that regenerates on a timer can skip or repeat cycles. Confirm that the displayed time and day match the real time. Then confirm the regeneration start time is set to a period when nobody in the house uses much water, and that the control is set to the mode the technician described on the sheet.
Confirm the bypass and the supply valves
Before the unit goes live, know which position the bypass valve should be in for normal service and which position means water skips the softener. Ask the technician to show you both positions and to point out the inlet and outlet shutoffs. You want to be able to isolate the softener yourself later without guessing. Also confirm that the water supply is turned on slowly, because a sudden pressure rush can disturb the resin bed and the valve seals in the first minutes of operation.
Look at the brine tank and the salt level
Open the brine tank and check three things. The salt should be the type the manufacturer specifies for this model, the level should sit where the instructions say it should, and the water in the tank should be at the level the technician set up. Salt that is loaded past the marked line can bridge or clog the brine well, and salt that is too low can leave the resin under-regenerated. Ask the technician to confirm the brine valve and float are working and that no salt has been spilled into the cabinet.
Verify the drain line and the air gap
A softener discharges wastewater at regeneration, and that discharge has to reach a drain without backing up or siphoning. Look at the drain line from the valve to the receiving point. It should have no kinks, it should not sit below the level that would let water siphon back into the unit, and it should end at an air gap or a drain standpipe as the local plumbing requirements and the installer's plan describe. Ask the technician to show you the discharge during the first regeneration, not just describe it.
Watch the first regeneration from start to finish
Most technicians will start a manual regeneration so you can see the cycle run. Watch the sequence: backwash, brine draw, slow rinse, and fast rinse, and then the unit returns to service. Each stage should show water moving in the direction the manual describes. Listen for a valve that sticks or a motor that stalls, and watch the drain for a steady flow rather than a sudden surge or a dribble. If the unit has a display, check that it reports the cycle stage correctly as it moves through them.
Test the treated water after the cycle
After the regeneration finishes and the unit is back in service, run a cold tap in the kitchen for a few minutes and then test the water with a hardness test kit or the method the installer recommends. You are checking that the output is softer than the input, which is the basic purpose of the unit. Record the result on the settings sheet with the date and time of the test. If the reading does not change, do not accept that the job is done. Ask the technician to check the programmed hardness value, the bypass position, and whether the unit is actually in service.
Questions to ask before you sign off
Ask the technician to answer these before leaving. Where did the hardness value come from, and can I see the test it was based on? When is the next regeneration scheduled, and at what time? How much salt will this model use per cycle, and how will I know when to refill? What should I do if the brine tank shows a salt bridge? Who do I call if the unit stops regenerating or the drain runs continuously? Written answers to these questions are part of the commissioning, not a formality. If the answers are unclear, the installation is not finished yet.
If you are comparing providers for a softener installation or service, the questions on this list can go on your side-by-side worksheet alongside price and warranty terms. For a plain explanation of how we match systems to households and compare providers, see the methodology page, or start from the Compare Water Treatment home page.