A properly sized softener regenerates about once a week. That cadence is not a rule someone invented; it falls out of the sizing math itself, because our sizing formula builds in a seven-day interval plus margin. Frequency outside that band is diagnostic information, and this page is about reading it.
What controls the schedule
Metered valves regenerate on consumption: they count the grains actually removed and schedule a cycle when the remaining capacity approaches the reserve. Calendar-timer valves regenerate on the clock whether the resin needs it or not, which is why we rate them lower across every comparison. If yours has no water-meter wire to the valve, it is a timer, and the schedule you see is a guess someone programmed.
Reading an abnormal schedule
| What you see | What it usually means | First check |
|---|---|---|
| Gradually more frequent regens over months | Household usage grew, or resin is tiring | Compare a recent water bill to the sizing math |
| Sudden doubling of frequency | Internal leak (valve not sealing) or a new Iron/junk load | Verify hardness at a test tap: soft or hard during the day? |
| Regen but water still hard | Brine not drawing: bridged salt, clogged injector, dead injector motor | Break up the salt bridge; clean the venturi |
| Regens at odd hours | Time lost after a power outage | Reset the clock; most SXT-class heads default to 2am |
| Never regenerates | No usage counted, meter stuck, or valve failed open | Run a faucet and watch the flow indicator |
Efficiency notes
Frequency is the lever for running cost. Fewer, fuller cycles waste less water per grain removed; our capacity explainer shows how salt-dose settings trade capacity against frequency. If your system regenerates twice weekly and the house is quiet at night anyway, that is your machine telling you the sizing deserves a second look before you buy anything — the sizing walkthrough has the formula. A unit that has stopped cycling altogether is usually not drawing salt rather than broken.