Alkaline Water Filter Maintenance: A Practical Guide for Australian Households

Maintaining your alkaline water filter properly ensures it keeps performing — and keeps your water quality consistent. Here’s a practical maintenance guide for Australian households.

Browse our replacement cartridge range or see our Benchtop Water Filters Guide. Also see our general Water Filter Maintenance Guide.

1. Replace the Filter Cartridge on Schedule

The most important maintenance task. Replace your 8-stage KDF cartridge every 6–12 months — at 6 months in hard water areas (Perth, Adelaide) or high-usage households (4+ people). Don’t wait for a change in taste or flow rate — the mineral and carbon stages exhaust gradually with no visible warning.

Browse our replacement cartridge range. If you’re unsure which cartridge fits your system, call us on 1800 789 781.

2. Scrub the Ceramic Dome Monthly

The ceramic outer shell of the cartridge accumulates sediment and mineral deposits over time, reducing flow rate. Scrub the outer surface monthly with a soft brush under running water. Do not use soap or abrasive scourers. This extends cartridge life and maintains flow rate.

3. Clean the Reservoir Every 3–6 Months

Clean the lower chamber (reservoir) with a mild food-safe sanitiser every 3–6 months. Rinse thoroughly before refilling. This prevents biofilm buildup in the lower chamber — particularly important in warm Australian conditions where bacterial growth is faster.

4. Monitor pH

If you want to verify your filter is raising pH as expected, use a pH test kit or digital pH meter. A healthy 8-stage KDF system should produce water at pH 7.5–8.5. If pH drops below 7.5, the mineral stages (Maifan stones, Prill Beads) may be exhausted — replace the cartridge. Call us on 1800 789 781 if you’re unsure.

5. Check for Leaks

Inspect the connection between the cartridge and the upper chamber monthly. A small drip usually means the cartridge isn’t seated correctly — remove and reseat by hand-tightening. Do not overtighten. If leaking persists, call us on 1800 789 781.

6. Store Replacement Cartridges Correctly

Store sealed replacement cartridges in a cool, dry place away from direct sunlight. Do not store in a garage or shed in Australian summer conditions — heat can degrade the carbon media. Cartridges have a long shelf life when stored correctly.

Troubleshooting Common Issues

Frequently Asked Questions