There is no universal whole-house filter lifespan. Replace each cartridge at the manufacturer’s stated capacity or service interval, and sooner if pressure drops across multiple outlets, a previously controlled taste, odour or sediment returns, the system shows a replacement warning, or the housing leaks.
Routine maintenance includes checking gauges and warning indicators, inspecting for leaks, replacing approved cartridges on schedule, and cleaning or sanitising only as the manufacturer directs. Delayed servicing can reduce performance, and bacteria can grow in a neglected filter. Water testing may still be needed to confirm filtration performance.
Common signs
- Low pressure throughout the home: Reduced flow from several hot and cold outlets can indicate a clogged cartridge or another restriction in the main supply. If only one outlet is affected, check its aerator, showerhead or fixture.
- Returning taste, odour or particles: The return of a problem the filter previously controlled may mean its media is exhausted or damaged.
- Cloudy or discoloured water: Filtration may be declining, although trapped air, pipe corrosion or a water-supply issue can cause similar changes.
- Replacement warning: Check the display, indicator or pressure gauges against the manufacturer’s instructions. Service intervals, capacity and acceptable readings vary by model, water use and incoming water quality.
- Visible sediment: Heavy build-up in a transparent housing can support a clogged-filter diagnosis. Do not open the housing while it is pressurised.
- Leaks or cracks: Water around the housing, head or fittings requires prompt attention. If safe, isolate the incoming supply and arrange an assessment.
Mineral scale is not necessarily a filter fault. Standard sediment and carbon cartridges generally do not soften hard water.
Check whether the filter is responsible
- Compare several outlets: A property-wide pressure reduction points towards the filter or another main-supply restriction; one affected outlet suggests a local fixture fault.
- Review the service details: Check the last replacement date, rated capacity and manufacturer’s maintenance instructions.
- Observe without dismantling: Record warning lights, gauge readings, visible sediment and leaks. Interpret readings only using the model’s documentation.
- Rule out a supply issue: If the pressure, colour, taste or odour changed suddenly, check Sydney Water’s current service information or ask whether nearby properties are affected.
- Test the water if performance remains uncertain: Appearance, taste and smell cannot identify every contaminant. A suitably NATA-accredited laboratory can advise on sampling. Comparing correctly collected pre-filter and post-filter samples shows what the system is removing; a post-filter sample alone only assesses the treated water.
What to do next
Replace a due or clogged cartridge with the specified part and follow the manufacturer’s procedure only if the system is designed for owner servicing and can be safely isolated and depressurised. Never loosen a pressurised housing. Do not attempt repairs to fixed plumbing, damaged housings, valves or electrical UV equipment; arrange appropriately licensed assistance.
If contamination is suspected, do not assume clear water is safe. Avoid using it as advised by Sydney Water or NSW Health and arrange suitable testing.
If the housing leaks, the cause remains unclear or pressure stays low after scheduled cartridge replacement, our Sydney water-filter maintenance team can assess the filter and connected plumbing.