How we research and rank water filters
Every guide on Water Filter Guide Australia follows the same process. We publish it so you can judge our picks for yourself.
1. We start with what Australians can actually buy
We only consider products stocked by Australian retailers, sold in Australian dollars, with Australian warranties. A product that is brilliant overseas but grey-imported here with no local support does not make the list.
2. We check the specifications that matter
For water filters that means the filtration method (activated carbon, carbon block, ceramic, KDF, reverse osmosis, ultrafiltration), the micron rating, the rated cartridge life in litres and months, flow rate, what the manufacturer says the filter reduces and by how much, and the ongoing cost of replacement cartridges, which over three years usually exceeds the price of the unit.
3. We check certifications and Australian standards
We look for independent certification to NSF/ANSI 42 (taste, odour and chlorine), NSF/ANSI 53 (health contaminants such as lead and cysts), NSF/ANSI 58 (reverse osmosis) and NSF/ANSI 372 (lead-free materials), and for WaterMark certification on anything that is plumbed into the mains, which Australian plumbing rules require. A claim that appears only in marketing copy, with no certification behind it, is treated as unverified.
4. We read owner reviews for patterns, not scores
Star ratings are easy to game. We look for repeated complaints and repeated praise across retailer reviews and owner forums, and we weight long-term ownership reports more heavily than first-week impressions.
5. We re-check prices
Prices in each guide are what we found at named Australian retailers on the date shown at the top of the guide. Prices change, and sales come and go, so always confirm on the retailer's site.
What we do not do
- We do not accept payment, free products or other consideration for inclusion or ranking.
- We do not write fake reviews or present opinions as tests we have not done. Where a pick is based on specifications and owner reports rather than our own hands-on use, the guide says so.
- We do not make health, safety or performance claims that the manufacturer's own documentation or a recognised certification does not support.