The best screw-on tap water filters in Australia: Philips X-Guard for most kitchens
The best screw-on tap water filter for most kitchens is the Philips X-Guard, $49.95 at Bunnings (checked 9 Nov 2026). It's the cheapest of the three we compared, needs no plumber and comes off when you move. The others are the Stefani ceramic at $61.62 and the Brita On Tap Pro V-MF at $98.
We may earn a commission when you buy through links on this page.Paid links: we may earn a commission. Between equal products or shops, one that pays us can go first. How this works.
Philips On-Tap 3-stage X-Guard micro filtration AWP3703, 1000 L
The cheapest on-tap filter at Bunnings, 2 L/min filtered (Philips), and the biggest refill here at 1,200 litres.
$49.95 at Bunnings, checked 9 Nov 2026
Paid links: we may earn a commission. As an Amazon Associate I earn from qualifying purchases. It doesn't change which product is here.
Our screw-on tap water filter picks at a glance
| Product | Best for most kitchensPhilips On-Tap 3-stage X-Guard micro filtration AWP3703, 1000 L $49.95 at Bunnings | Cheapest to runStefani Lead Free On Tap ceramic water filter system OTF32A $61.62 at Bunnings | Litre counter on the unitBrita On Tap Pro V-MF tap water filter system, 600 L $98 at Bunnings |
|---|---|---|---|
| Yearly running cost | About $50 at 2 L a day: one AWP315 refill, $49.95 at Bunnings (22 Oct 2026) | About $18 to $36: one or two OTFFIL refills at $18.24 (Bunnings) | About $115: three refills a year at $38.22 (Bunnings) |
| Certification | – None found on NSF, IAPMO or WQA listings (21 Oct 2026); the chlorine claim is Philips' own | – None found on NSF, IAPMO or WQA listings (checked 21 Oct 2026); the bacteria, lead and microplastics claims are Stefani's own | – None found on NSF, IAPMO or WQA listings (checked 21 Oct 2026); Brita cites its own testing to Japan's JIS S 3201 for bacteria |
| Fits | Most standard round kitchen spouts, with adapters in the box (Philips); not pull-out or square spouts | Most standard Australian and NZ taps with an external or internal thread (Bunnings) | Most standard taps, with five adapters in the box (Brita) |
| Why it's here | The cheapest on-tap filter at Bunnings, 2 L/min filtered (Philips), and the biggest refill here at 1,200 litres. | Refills are $18.24 for 1,000 litres, about a third of the Philips refill price. Stefani publishes no flow rate. | An LCD counts down the 600 litres in each cartridge. Dearest to run, at about $115 a year. |
| Watch out for | No certification listing, so its claims are Philips' own | No flow rate or change interval published | Dearest to run of the three: about $115 a year |
| Buy | $49.95 at BunningsToday's price on Amazon (EU import) | $61.62 at Bunnings | $98 at Bunnings |
The cheapest on-tap filter at Bunnings, 2 L/min filtered (Philips), and the biggest refill here at 1,200 litres.
The cheapest on-tap filter at Bunnings, 2 L/min filtered (Philips), and the biggest refill here…
Watch out: No certification listing, so its claims are Philips' own
- Yearly running cost: About $50 at 2 L a day: one AWP315 refill, $49.95 at Bunnings (22 Oct 2026)
- Certification: None found on NSF, IAPMO or WQA listings (21 Oct 2026); the chlorine claim is Philips' own
- Fits: Most standard round kitchen spouts, with adapters in the box (Philips); not pull-out or square spouts
$49.95 at Bunnings · checked 9 Nov 2026
Refills are $18.24 for 1,000 litres, about a third of the Philips refill price. Stefani publishes no flow rate.
Refills are $18.24 for 1,000 litres, about a third of the Philips refill price.
Watch out: No flow rate or change interval published
- Yearly running cost: About $18 to $36: one or two OTFFIL refills at $18.24 (Bunnings)
- Certification: None found on NSF, IAPMO or WQA listings (checked 21 Oct 2026); the bacteria, lead and microplastics claims are Stefani's own
- Fits: Most standard Australian and NZ taps with an external or internal thread (Bunnings)
$61.62 at Bunnings · checked 9 Nov 2026
An LCD counts down the 600 litres in each cartridge. Dearest to run, at about $115 a year.
An LCD counts down the 600 litres in each cartridge.
Watch out: Dearest to run of the three: about $115 a year
- Yearly running cost: About $115: three refills a year at $38.22 (Bunnings)
- Certification: None found on NSF, IAPMO or WQA listings (checked 21 Oct 2026); Brita cites its own testing to Japan's JIS S 3201 for bacteria
- Fits: Most standard taps, with five adapters in the box (Brita)
$98 at Bunnings · checked 9 Nov 2026
Quick answer: Best for most: the Philips X-Guard on-tap filter, $49.95 at Bunnings (checked 9 Nov 2026), also on Amazon Australia as an EU import. Its AWP315 refill was $49.95 for 1,200 litres when last checked, so about $50 a year at two litres a day. Cheapest to run: the Stefani Lead Free ceramic, $61.62 at Bunnings, with $18.24 refills. Want a litre counter: the Brita On Tap Pro V-MF, $98 at Bunnings, but about $115 a year in refills. None of the three is on an NSF, IAPMO or WQA certification listing, and none claims to remove fluoride. They fit standard round spouts, so check your tap first.
How we picked: We compared the screw-on tap filters sold at Bunnings, the main Australian shop that stocks them, on price, yearly cartridge cost (refill price and rated life, at about two litres a day), which taps they fit, and certification, looked up on the NSF, IAPMO and WQA listings on 21 Oct 2026. We haven't tested them hands-on yet. Specs and reduction claims are the makers' and are labelled as theirs. Not covered yet: Kmart's and Big W's on-tap filters (their sites blocked our checks). Commission never puts a worse product ahead of a better one, but between equal products or shops, one that pays us can go first. Full method.
A screw-on tap filter costs about the same as a jug and lives on the spout. It filters as you pour, and one cartridge is rated for 600 to 1,200 litres, against 150 for a Brita jug cartridge. It needs no plumber and comes off when you move.
Questions to ask before buying a tap water filter in Australia
- Does it fit my tap? These screw on in place of the aerator, so round threaded spouts only. Check for pull-out, square or sensor spouts before you buy, and keep the aerator.
- What does it take out? Chlorine and taste. The national guidelines put the chlorine odour threshold at about 0.6 mg/L. None of the three here claims to remove fluoride, which is limited to 1.5 mg/L.
- Is it certified? Check the model on the IAPMO and NSF listings. None of the three we compared was listed when we checked, so treat their filtering figures as the makers’.
- I rent. Can I fit one? The Queensland rule that needs written approval is about fixtures, generally items permanently attached. A filter that screws off when you move is a different thing, but put the original aerator back when you leave.
- What happens if it fails after the warranty? The ACCC says the consumer guarantee of acceptable quality usually still applies after a warranty expires.
How they fit
The unit screws onto the spout in place of the aerator, using one of the thread adapters in the box. A lever or button switches between filtered water and a normal unfiltered stream for washing up. The catch is fit: pull-out spray mixers, square spouts and designer taps with hidden aerators usually can’t take one. Unscrew your aerator and look for a standard thread before you buy. Can’t fit anything to your tap? A water filter jug needs no tools.
Because nothing connects to the plumbing, an on-tap filter needs no WaterMark and no plumber, which is why it suits renters.
What they remove
Carbon, mainly, for chlorine, taste and odour. Philips says the X-Guard reduces up to 99% of chlorine. Stefani says its ceramic unit reduces bacteria, microplastics, chlorine and lead, and Brita says its 0.5 micron membrane reduces bacteria and fine particles. None of those claims is backed by a certification listing: we searched NSF, IAPMO and WQA for all three brands on 21 October 2026 and found none of these filters. Treat the extra claims as the makers’ own, and none of them claims to remove fluoride. For certified PFAS reduction you need a plumbed filter such as the Philips FastFlow under-sink, or a certified benchtop unit.
What they cost to run
| Filter | Price | Refill | Refill rated for | Yearly at 2 L a day |
|---|---|---|---|---|
| Philips X-Guard (AWP3703) | $49.95 | AWP315, $49.95 | 1,200 L | About $50, or $100 if changed twice a year |
| Stefani Lead Free ceramic (OTF32A) | $61.62 | OTFFIL, $18.24 | 1,000 L | About $18 to $36 |
| Brita On Tap Pro V-MF | $98 | V-MF refill, $38.22 | 600 L or 4 months | About $115 (three refills) |
Bunnings prices, checked 21 October 2026. Two litres a day is about 730 litres a year, for drinking and cooking. The Philips ships with an AWP305 cartridge that Philips Australia lists as discontinued; Philips names the AWP315 as its replacement.
The picks
The Philips X-Guard is the one most kitchens should buy: the cheapest on-tap filter at Bunnings, a published flow of 2 litres a minute, and a 1,200 litre refill: at two litres a day that is more than a year and a half by volume. Change it sooner if the water starts to taste of chlorine. The Stefani Lead Free ceramic costs a little more to buy and much less to run, at $18.24 a refill. The Brita On Tap Pro V-MF is the pick if you want a screen that tells you how much filter is left, but at four months a cartridge it costs more a year than either of the others.
The competition
We checked these on 21 October 2026.
- Stefani On-Tap Digital ($145 at Bunnings, chrome or white). Despite the name, Bunnings describes it as a benchtop purifier fed by a tap diverter and tube, not a filter that screws onto the spout. It costs nearly three times the Philips.
- Aquaport On Tap ($81 at Bunnings). Refills are cheap ($34.94 for two, each rated 1,200 litres or three to six months), but it costs more to buy than the Stefani, and its chlorine figure is the maker’s own.
- Philips Softening+ on-tap converter ($259 at Bunnings). Adds a softening cartridge, at five times the price of the X-Guard.
- PUR and Brita US faucet filters (Amazon US imports). Certified on the NSF and WQA listings to NSF/ANSI 42, 53 for lead, and 401. They are US models with US threads, and we couldn’t confirm they fit Australian taps.
- Philips X-Guard Ultra (AWP3756). Philips says it’s available through Bunnings, but we couldn’t find it there; on Amazon it’s an import.
The one trap
Buying before checking your tap. A pull-out spray head, a square spout or a hidden aerator means none of these will fit. Unscrew the aerator first: these filters are made for a standard thread inside or outside the spout, with adapters in the box.
Where to buy the screw-on tap water filter picks
- Philips On-Tap 3-stage X-Guard micro filtration AWP3703, 1000 L$49.95 at Bunnings
- Stefani Lead Free On Tap ceramic water filter system OTF32A$61.62 at Bunnings
- Brita On Tap Pro V-MF tap water filter system, 600 L$98 at Bunnings
Paid links: we may earn a commission. Prices change; the shop's page is the final word.
The screw-on tap water filter picks in detail
Tap a pick for its full specs, pros and cons and every shop.
Best for most kitchensPhilips On-Tap 3-stage X-Guard micro filtration AWP3703, 1000 L
$49.95 at Bunnings · checked 9 Nov 2026Specs, pros and cons, all 2 shops
The cheapest on-tap filter at Bunnings, 2 L/min filtered (Philips), and the biggest refill here at 1,200 litres.
- Fits: Most standard round kitchen spouts, with adapters in the box (Philips); not pull-out or square spouts
- Flow rate: 2 L/min at 150 to 350 kPa (Philips spec sheet)
- Cartridge life: 1,000 L in the box. Philips names the AWP305 refill (1,000 L) for this unit; Bunnings sells the AWP315 (1,200 L), which Philips sells "for Philips on-tap solutions"
- Yearly running cost: About $50 at 2 L a day: one AWP315 refill, $49.95 at Bunnings (22 Oct 2026)
- Certification: None found on NSF, IAPMO or WQA listings (21 Oct 2026); the chlorine claim is Philips' own
- WaterMark: Not needed: screws onto the tap spout
- Install: Screws onto the spout, no tools
Pros
- $49.95 at Bunnings on 22 Oct 2026, and the biggest refill of the on-tap units we compared (AWP315, rated 1,200 L)
- The biggest refill here: the AWP315 is rated 1,200 L
- Filtered, unfiltered and shower-spray modes, and a change reminder
Cons
- No certification listing, so its claims are Philips' own
- Philips names the AWP305 refill for this unit, but only the AWP315 was on sale in Australia when we checked (22 Oct 2026)
- Does not fit pull-out or square spouts
Paid links: we may earn a commission. As an Amazon Associate I earn from qualifying purchases. Price checked 9 Nov 2026.
Cheapest to runStefani Lead Free On Tap ceramic water filter system OTF32A
$61.62 at Bunnings · checked 9 Nov 2026Specs, pros and cons and where to buy
Refills are $18.24 for 1,000 litres, about a third of the Philips refill price. Stefani publishes no flow rate.
- Fits: Most standard Australian and NZ taps with an external or internal thread (Bunnings)
- Cartridge life: 1,000 L (Stefani); no time interval stated
- Yearly running cost: About $18 to $36: one or two OTFFIL refills at $18.24 (Bunnings)
- Certification: None found on NSF, IAPMO or WQA listings (checked 21 Oct 2026); the bacteria, lead and microplastics claims are Stefani's own
- WaterMark: Not needed: screws onto the tap spout
- Install: Tool-free, no plumber
Pros
- The cheapest refills of the on-tap filters at Bunnings: $18.24 for 1,000 L
- Filtered and unfiltered switch
Cons
- No flow rate or change interval published
- Its reduction claims carry no certification listing
Paid links: we may earn a commission. Price checked 9 Nov 2026.
Litre counter on the unitBrita On Tap Pro V-MF tap water filter system, 600 L
$98 at Bunnings · checked 9 Nov 2026Specs, pros and cons and where to buy
An LCD counts down the 600 litres in each cartridge. Dearest to run, at about $115 a year.
- Fits: Most standard taps, with five adapters in the box (Brita)
- Cartridge life: 600 L or 4 months (Brita); an LCD counts down the litres
- Yearly running cost: About $115: three refills a year at $38.22 (Bunnings)
- Certification: None found on NSF, IAPMO or WQA listings (checked 21 Oct 2026); Brita cites its own testing to Japan's JIS S 3201 for bacteria
- WaterMark: Not needed: screws onto the tap spout
- Install: Tool-free, no plumber
Pros
- LCD shows how many litres the cartridge has left
- Refills at Bunnings and Officeworks
Cons
- Dearest to run of the three: about $115 a year
- Half the cartridge life of the Philips refill
Paid links: we may earn a commission. Price checked 9 Nov 2026.
Frequently asked questions
What is the best screw-on tap water filter in Australia?
For most kitchens, the Philips X-Guard: $49.95 at Bunnings (checked 21 October 2026), with $49.95 refills rated 1,200 litres. The Stefani Lead Free ceramic ($61.62) is cheaper to run at $18.24 a refill, and the Brita On Tap Pro V-MF ($98) has a litre counter but costs about $115 a year in refills.
Will an on-tap filter fit my tap?
They fit standard round spouts with a removable aerator, using the adapters in the box. They will not fit most pull-out mixers, square spouts or taps with integrated aerators. Unscrew your aerator and check for a thread before buying. Stefani says its ceramic unit suits most Australian and New Zealand taps with an external or internal thread.
Do on-tap filters reduce water pressure?
Flow is slower in filtered mode, which is why they have a switch for unfiltered water. Philips rates the X-Guard at 2 litres a minute filtered; we found no figure for the Stefani. In unfiltered mode the flow is normal.
Are on-tap water filters certified?
Not the ones sold in Australian shops. We searched the NSF, IAPMO and WQA listings for Philips, Stefani, Brita and Aquaport on 21 October 2026 and found none of their on-tap filters. PUR's and Brita's US faucet filters are certified to NSF/ANSI 42, 53 and 401, but they are US imports with US threads.
Are on-tap filters better than a jug?
For running cost and convenience, usually. A Philips AWP315 refill is rated for 1,200 litres, eight times a Brita jug cartridge's 150 litres, and you don't wait for water to drip through. For filtering, both are carbon based and neither is certified. None of these makers claims to remove fluoride.
How often do you change an on-tap filter cartridge?
When it reaches its rated litres or the maker's time limit. Brita says 600 litres or four months for the On Tap Pro V-MF, and its screen counts down. Philips rates the AWP315 at 1,200 litres and the X-Guard has a change reminder. Stefani rates the ceramic refill at 1,000 litres and gives no time limit, so we would change it at least twice a year.