The installer's job ends when the unit is set, tested, and signed off. Your job starts the first time you turn on a tap and the softener runs its first cycle without anyone watching. Most early surprises after an install are small and easy to catch if you know what to look at, and hard to explain later if nobody wrote down the starting point. This guide covers the checks a homeowner can make during the first week and who to ask when something does not match what the tech showed you.
Write down the starting point before you do anything else
Before the first week is over, get the start-up details in writing. Ask for or copy the hardness setting the tech programmed, the regeneration time of day, the salt type and fill level the tech left, the bypass valve position, and the name and number of the service line. If the tech wrote these on a tag or a sheet, photograph it. If nothing was written, ask for the record before the crew's next visit. A starting point you can compare against is worth more than a good memory.
Check the first regeneration
Most softeners regenerate on a schedule or after a set volume of water is used. Your first regeneration may happen when the house is quiet, which is why it is easy to miss. Find out when it is scheduled, then listen and look around that time. Note whether the unit ran, whether the drain line carried water, and whether the display or control head shows the expected time. If the regeneration started at a different hour than the one the tech set, write down what you saw and call the installer rather than changing the settings yourself.
Run a few taps and note how the water feels
Run cold water at the kitchen sink and one other fixture, then check how the water feels and looks compared with what you had before. Softened water usually feels slicker, and soap lathers more easily. Watch for cloudiness, odor, or spotting on glassware. These are useful first signs, but early results can be affected by the unit's first cycle and by water that sat in the lines, so give it a few days before you judge the taste or feel. Keep notes with the day you first noticed anything.
Walk the fittings and the drain line
Look at every connection the crew touched, including the inlet, the outlet, the bypass, and the drain line. Wipe each joint with a dry paper towel and check again after a day. A fitting that seeps usually shows a line, a ring, or a damp spot before it drips. Check the drain line for slow flow or any sign it has come loose from its support. Also look at the floor under and around the unit, not just the connections. If you find moisture, photograph it, note the location, and call the installer before you tighten anything yourself.
Check the salt and the brine level
The tech should have shown you how to check the brine tank and the salt level. Look at the salt once during the first week and again after a few regenerations. Keep the salt at the level the manufacturer's instructions describe, and do not overfill. If the brine level looks wrong or the salt is forming a crust or bridge, note it. Confirm what kind of salt the unit was set up for before you buy the next bag.
Decide who you call and what goes in the note
Set a simple rule for yourself. If a checkpoint matches the starting record, write a short note and move on. If it does not match, or if you see water where there should be none, call the installer's service line first. When you call, have the start-up record, your list of observations, and the times in front of you. A clear note gets a faster answer than a call that opens with 'it is not working.' The first week is also the best time to learn who answers the phone, how quickly they respond, and whether the service line matches what the install paperwork promised.