Cartridge replacement (all filter types): Benchtop, under-sink, shower, and whole house cartridge replacement is DIY-friendly. For under-sink filters, close the inlet shut-off valve, relieve pressure, swap the cartridge, and restore flow. See our Under Sink Water Filters Guide for step-by-step instructions.
Ceramic dome scrubbing: The outer ceramic shell of a ceramic dome filter can be scrubbed with a soft brush under running water to restore flow rate. Do this monthly or when flow reduces noticeably.
Reservoir cleaning (benchtop and cooler systems): Clean the reservoir every 3–6 months with a mild food-safe sanitiser. Rinse thoroughly before refilling.
O-ring inspection and replacement: Check the O-ring on filter housings when replacing cartridges. Clean and apply food-grade silicone grease. Replace if cracked or damaged.
Leak checks: Check all connection points monthly. Tighten loose fittings by hand.
What to Leave to a Plumber
Water line connections: If a leak is coming from a pressurised water line fitting (not the filter housing), turn off the water supply and call a licensed plumber. Do not attempt to repair pressurised water line fittings yourself.
RO system installation: Initial installation of an under-sink RO system involves connecting to the cold water supply and (usually) a drain line. A plumber is recommended for the initial installation.
Frequently Asked Questions
How often should I replace my water filter cartridge?
Every 6–12 months for most cartridge types. Set a calendar reminder when you install a new cartridge. Browse our replacement cartridge range.
Do I need a plumber to replace my under-sink filter cartridge?
No — cartridge replacement is DIY-friendly. Use the inlet shut-off valve to isolate the filter, swap the cartridge, and restore flow. Call us on 1800 789 781 if you need guidance.
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