When to Change a Whole House Water Filter Cartridge
July 10, 20212 min read
Whole house filter cartridges don’t last forever — and a clogged or exhausted cartridge provides little to no filtration. Here’s a clear guide to replacement intervals and what to watch for.
Replace immediately if water discolouration occurs
These are general guidelines — actual replacement frequency depends on your water quality and household usage. High-sediment water (bore, tank, or some regional supplies) will exhaust sediment cartridges faster.
Signs Your Cartridge Needs Replacing
Reduced water pressure throughout the house — the most common sign of a clogged sediment cartridge
Returning chlorine taste or smell — indicates the carbon cartridge is exhausted
Visible discolouration in the cartridge (if using a clear housing)
Water discolouration — replace immediately and check for iron or sediment issues
Tips for Remembering to Replace
Set a recurring calendar reminder on your phone at the time of each replacement
Write the replacement date on the cartridge housing with a marker
Order replacement cartridges in advance so you always have a spare on hand
Browse our replacement cartridge range — we stock cartridges for all Big Blue housing sizes with Australia-wide delivery.
Frequently Asked Questions
Can I reuse a whole house filter cartridge?
Polyester sediment cartridges can be rinsed and reused a limited number of times. Cellulose (paper) cartridges should not be reused — the surface can tear and allow sediment through. Carbon cartridges cannot be regenerated and must be replaced. When in doubt, replace.
What micron rating should I use for my whole house filter?
For most Australian town water supplies, a 5–10 micron sediment pre-filter paired with a carbon block is the standard choice. Lower micron ratings (1–5 micron) provide finer filtration but reduce flow rate and require more frequent replacement. Use a lower micron rating only if your water has very fine sediment or you’re filtering bore/tank water.
