Maintain each whole-house treatment stage against its own service trigger. A slow kitchen faucet can reveal a problem, but it cannot tell you that carbon still meets its chemical claim or that a disinfection stage works. One sink symptom is not a complete maintenance programme.
Build a stage register
| Stage | Record | Service trigger to obtain from its documents |
|---|---|---|
| Sediment | Housing/cartridge code and clean operating readings | Permitted restriction, time and other specified limits |
| Carbon | Exact claim, capacity and installation date | Rated volume/time and required performance checks |
| Softener | Settings, salt type and service history | Manufacturer’s operating and maintenance requirements |
| UV or other powered treatment | Model, alarms and component dates | Lamp/component schedule and specified verification |
| Valves and housings | Part identity and inspection findings | Damage, leaks and model-specific replacement requirements |
Do not copy a generic one-to-three-month cartridge interval into every row. A system’s earliest applicable limit controls; taste and appearance cannot extend a specified replacement interval.
Keep three types of record separate
Routine observation: note leaks, alarms and unusual behavior without dismantling anything. Follow the response stated in the manual, particularly when the treatment has a health-related duty.
Completed service: record the actual replacement date, part code and required cleaning, sanitation or flushing. A purchased spare or reset reminder is not a completed service event.
Performance verification: record the appropriate measurement for the treatment claim. Pressure readings establish hydraulic behavior; laboratory or other specified tests answer different questions.
A useful service-log entry
An entry should read like a reproducible event: “Sediment cartridge model X replaced on date Y; inlet/outlet readings recorded at the same fixture combination; specified restart completed; no leak observed; final valve route confirmed.” In your actual log, use the real model, date and measurements. Keep invoices and reports with it.
If the next cartridge loads much faster, compare water conditions and demand before concluding that the brand failed. A source change, plumbing disturbance or a different cartridge specification may explain the difference. Sudden well-water changes require appropriate investigation, not just more frequent filter swaps.
Prepare for service without inventing a procedure
Keep approved parts sealed and dry, the correct tool available and the manual accessible. Use the exact isolation, pressure-release, cleaning and restart instructions. Do not mix cleaning chemicals or substitute a generic sanitizer recipe.
Our performance-check guide maps objectives to measurements, and the bypass guide covers the untreated route. EPA’s well guidance explains when source-water testing deserves attention beyond routine equipment service.