Water filter cartridge replacement calculator
Find out when your next cartridge change is due, how many you need for the year, and which pack saves you the most.
Change every
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Next change due
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Cartridges needed
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Your cartridge is overdue. An old cartridge stops reducing chlorine and taste, and can slow your flow.
Also due on the same schedule
Never miss a filter change
Get a repeating reminder in your calendar.
Reminder downloaded. Open the file to add it to your calendar.
Change sooner if flow slows or the taste returns. Intervals follow our standard replacement guide.
How often should you change your water filter?
Most gravity-fed benchtop and cooler cartridges, including our 8-stage cartridges, need changing every 6 months. After that, the media stops reducing chlorine, taste and odour as well as it did when new.
Change sooner if:
The flow slows
Trapped sediment is clogging the cartridge.
The taste comes back
The carbon is used up and chlorine is getting through.
More people are using it
Offices, daycares and busy homes use up a cartridge faster.
Replacement guide for every part
Each part of your system has its own schedule. Here's when to replace it, and how to look after it in between.
7 and 8-stage cartridges
- Replace
- Every 6 months
- Care
- Soak, then run under the tap before installing and at every cooler clean.
97% fluoride reduction dome
- Replace
- Every 6–12 months, depending on use
- Care
- Scrub lightly with a new scouring pad under cold water. No soap.
Ceramic dome
- Replace
- Every 6–12 months
- Care
- Rub with a soft, non-abrasive pad under cold water. No soap.
Sediment dome
- Replace
- Every 6–12 months
- Care
- Wash and wipe. Change the felt pads when you change the cartridge.
Maifan stones
- Replace
- Every 12 months
- Care
- Boil every 3 months with 1 tsp salt (stones only, not the container).
Magnesium prill beads
- Replace
- No need to replace
- Care
- Rinse off dust. Soak in boiling water for 5–10 minutes to re-energise.
Frequently asked questions
Quick answers to what customers ask us most about replacing cartridges.
What happens if I don't change my cartridge?
An exhausted cartridge stops reducing chlorine and taste, and trapped sediment can slow the flow to a trickle.
Can I clean and reuse a cartridge?
Not an 8-stage cartridge: the media inside is used up, so rinsing won't restore it. Ceramic and sediment domes can be cleaned between replacements.
Is it cheaper to buy a multi-pack?
Yes. Packs cost less per cartridge than singles, and the calculator above shows the exact saving at today's prices.
How do I remember when to change it?
Use "Add reminders to my calendar" in the calculator. It adds a repeating reminder to your phone or computer calendar.