How to choose a water filter in Australia
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A decision guide that starts with your water and your home, not with products. Which filter type fixes which problem, what certifications mean, and running costs.
Filters are sold by product type. Water problems do not come that way. This guide works from the problem back to the product.
Step 1: identify the problem
| What you notice | Likely cause | Filter that fixes it |
|---|---|---|
| Chlorine taste or pool smell | Mains disinfection | Any activated carbon filter (jug, on-tap, under-sink) |
| Same, but carbon filters barely help | Chloramine disinfection | Catalytic carbon or vitamin C (shower) |
| Grit, cloudiness, brown tint | Tank, bore or old pipes | 5 micron sediment pre-filter, then carbon |
| You want fluoride out | Mains fluoridation | Reverse osmosis |
| Concern about lead from old fittings | Pre-1990s brass or solder | NSF/ANSI 53 certified carbon block, or RO |
| Concern about PFAS | Local contamination history | NSF/ANSI 53 or P473 certified block, or RO |
| Drinking rainwater or tank water | Untreated source | 0.5 micron absolute filter plus UV or boiling |
| White scale on kettles | Hard water (Adelaide, Perth, some regional areas) | Ion-exchange softener; filters do not fix this. See the softener guide |
Step 2: decide what you can install
Renting, or nothing permanent: jug, on-tap unit, bench top water filter (gravity) or countertop reverse osmosis. None connects to the mains. The renters’ guide compares all six no-plumber options.
Own the home: under-sink filter or under-sink RO, installed by a licensed plumber using WaterMark-certified products. Whole-house filtration if the problem is house-wide (tank water, sediment, chlorine in every shower).
Step 3: check the certification, not the marketing
- NSF/ANSI 42: chlorine, taste, odour (aesthetic).
- NSF/ANSI 53: lead, cysts, VOCs and other health contaminants, each listed and tested.
- NSF/ANSI 58: reverse osmosis systems.
- NSF/ANSI 372: lead-free materials.
- WaterMark: Australian plumbing certification required for anything connected to the water supply.
“Removes 99% of contaminants” with no certification is a claim, not a result.
Step 4: price the running cost
| Filter type | Unit | Typical yearly cartridges |
|---|---|---|
| Jug | $19 to $45 | $100 to $150 |
| On-tap | $50 to $145 | $40 to $60 |
| Benchtop gravity | $60 to $100 | $20 to $40 |
| Under-sink inline | From $96 | $40 to $120 |
| Under-sink housings (10 inch) | $125 to $188 | $20 to $60 |
| Reverse osmosis | $235 to $500 | $80 to $200 plus water to drain |
Over three years the cartridges usually cost more than the filter. Standard 10 inch housings that take generic cartridges are the cheapest to run.
Step 5: buy the boring one
The filter that gets used is the one that is easy to maintain. A jug that never gets its cartridge changed is worse than no filter, because a saturated carbon cartridge can shed what it has collected. Pick the type you will actually service, put the change date in your calendar, and buy the cartridges at the same time as the unit.
Our category guides cover each type: jugs, on-tap, benchtop, under-sink, reverse osmosis, whole-house, shower and caravan.
Frequently asked questions
What is the best type of water filter for home use in Australia?
For most homes on mains water, a plumbed under-sink carbon filter is the best balance of filtration, convenience and running cost. Renters should choose an on-tap unit or a jug. Tank households need a sediment stage first. Anyone removing fluoride needs reverse osmosis.
How do I know what is in my tap water?
Every Australian water utility publishes annual water quality reports online showing disinfectant type, fluoride level and hardness for your supply zone. Search your utility's name plus water quality report. A twenty-dollar TDS meter or a home test kit gives a rough picture of your own taps.
Is a more expensive water filter better?
Not automatically. Price tracks brand, finish and features more than filtration. An independent certification tells you more about performance than the price does.