MaintainlyHow often should you replace your whole-house sediment filter?
Replace whole-house sediment filter every 3 months. The commonly recommended range is every 3-6 months. A clogged sediment filter drops water pressure and lets grit through.
A sediment filter sits where the supply enters the house and catches sand, silt, rust and scale before they reach anything else. It protects every valve, cartridge and appliance downstream of it, and it is the one filter people forget exists because it lives in a basement or a garage.
Why does replacing your whole-house sediment filter matter?
A clogged sediment filter drops water pressure and lets grit through.
What happens if you skip replacing your whole-house sediment filter?
A blocked cartridge chokes flow to the whole house, so pressure drops everywhere at once and people start suspecting the mains. A cartridge left in place long past its life also stops protecting the softener, heater and appliances it was fitted to protect.
How do you do it?
- Shut off the supply. Close the inlet valve before the housing, and the outlet valve after it if fitted.
- Release the pressure. Open a cold tap downstream, or press the pressure relief button on top of the housing if it has one.
- Unscrew the housing. Use the plastic spanner supplied with the unit. Have a bucket underneath, as the housing is full of water.
- Note the cartridge orientation and micron rating. The rating is printed on the cartridge or its wrapper. Finer filters catch more but block sooner.
- Clean the housing and check the O-ring. Wipe the sealing groove, inspect the O-ring for nicks, and smear it with silicone grease. A dry or nicked O-ring lets the housing weep.
- Fit the new cartridge and hand-tighten. Do not over-tighten with the spanner, which distorts the seal.
- Reopen slowly and check for leaks. Open the inlet valve gradually to avoid a pressure surge, then watch the seal for a minute.
What does it take?
How do you know replacing your whole-house sediment filter is overdue?
- Pressure dropping across the whole house rather than at one fixture
- The cartridge visibly brown or orange through a clear housing
- Sediment appearing in tap aerators or showerheads downstream
- A pressure gauge before and after the filter showing a widening gap
What do people get wrong?
- Reusing a dry, damaged O-ring, which then weeps for months
- Over-tightening the housing, which distorts the seal rather than improving it
- Fitting too fine a micron rating for the supply, so it blocks far sooner than it should
- Forgetting to depressurise, which sprays the room when the housing comes loose
What changes how often you need to do it?
- Sediment level decides it: for well water, HomeGuide puts cartridge changes at every one to three months
- Mains work or a burst nearby stirs the supply and can load a cartridge quickly
- A clear housing lets you change by sight rather than by calendar, which is genuinely better
When should you stop and call someone?
If pressure is still poor with a fresh cartridge, the restriction is elsewhere: a partly closed valve, a failing pressure reducing valve, or scaled pipework. That needs a plumber rather than another filter.
Does this differ in the US, UK, Australia or Canada?
United States
Most well water systems include a sediment filter as the first stage, ahead of any iron filter and softener. A sediment cartridge does nothing for germs or dissolved chemicals, and the Environmental Protection Agency advises testing a private well every year for total coliform bacteria, nitrates, total dissolved solids and pH.
United Kingdom
Whole-house sediment filtration is unusual on mains supply. The Drinking Water Inspectorate says public tap water in England and Wales needs no additional treatment in the home as a health measure, and that a filter may help as a temporary measure where particles or colour come from pipes and fittings the building owner is responsible for. Where filters exist they are typically on private supplies such as boreholes.
Australia
Most often found on rainwater tank and bore supplies. On a tank supply the filter is only one part of the upkeep: gutters, screens and the tank itself need attention upstream of it. After heavy ash fall or a long dry spell, check the cartridge rather than waiting for the schedule.
Canada
Mostly found on rural well systems, often ahead of an iron filter and a softener. Filter housings in unheated basements or crawl spaces need protection from freezing.
Frequently asked questions
Why does replacing your whole-house sediment filter matter?
A clogged sediment filter drops water pressure and lets grit through.
What happens if you skip replacing your whole-house sediment filter?
A blocked cartridge chokes flow to the whole house, so pressure drops everywhere at once and people start suspecting the mains. A cartridge left in place long past its life also stops protecting the softener, heater and appliances it was fitted to protect.
Does replacing your whole-house sediment filter differ by country?
Common on well water (rural US/CA). UK mostly mains water, lower surfacing.
How we put this together
The figures, intervals and legal points on this page were checked against the sources listed below. The default interval and accepted range are the ones Maintainly uses in its task library. Costs and times are typical ranges and vary by region and by home. Your own manufacturer's instructions come first, and gas, electrical and structural work belongs with a qualified professional. How we research and write.
Sources
- Well Water Filtration System Cost (sediment filters), HomeGuide. Checked 11 October 2026.
- Water Filtration System Repair Cost, HomeGuide. Checked 11 October 2026.
- Protect Your Home’s Water (private wells), US Environmental Protection Agency. Checked 11 October 2026.
- Domestic water filters and softeners, Drinking Water Inspectorate. Checked 11 October 2026.
Next steps
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