Shower filter cartridges: when to replace and what they cost
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Philips 3-stage shower filter, KDF and double mesh
KDF cartridges are cheap and last well on chlorine supplies.
Price on the retailer's page
Paid links: we may earn a commission. As an Amazon Associate I earn from qualifying purchases. It doesn't change which product is here.
A shower filter is only as good as its cartridge. Replacement intervals, running cost per year for the filters sold in Australia, and how to tell when the media is spent.
Our picks at a glance
| Product | Lowest running costPhilips 3-stage shower filter, KDF and double mesh Price at the retailer | Vitamin C refillsQuoss Universal chlorine shower filter $128 at Bunnings |
|---|---|---|
| Media | KDF plus mesh stages | Vitamin C (ascorbic acid) cartridge |
| Fits | Standard shower arm thread | Standard half-inch thread, before your head or hand-shower hose |
| Why it's here | KDF cartridges are cheap and last well on chlorine supplies. | Vitamin C refills as a Bunnings Special Order, or on Amazon. |
| Watch out for | Cartridges need replacing every few months | A Special Order at Bunnings, not a shelf item |
| Buy | Today's price on Amazon | Today's price on Amazon$128 at Bunnings (Special Order) |
KDF cartridges are cheap and last well on chlorine supplies.
KDF cartridges are cheap and last well on chlorine supplies.
Watch out: Cartridges need replacing every few months
- Media: KDF plus mesh stages
- Fits: Standard shower arm thread
Price at the retailer
Vitamin C refills as a Bunnings Special Order, or on Amazon.
Vitamin C refills as a Bunnings Special Order, or on Amazon.
Watch out: A Special Order at Bunnings, not a shelf item
- Media: Vitamin C (ascorbic acid) cartridge
- Fits: Standard half-inch thread, before your head or hand-shower hose
$128 at Bunnings, checked 9 Nov 2026 · Amazon's price is on its page
How we picked: We picked these 2 from the water filters sold in Australia, judged on media, fits and price, using maker specs, Australian retailer prices and owner reports. We haven't tested them hands-on yet, and maker claims are labelled as theirs. 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.
The filter is the one-off cost. The cartridge is the subscription. Before buying, work out the yearly cost of the cartridges, because it will exceed the price of the unit within two years.
Running cost of the filters we recommend
The Philips 3-stage uses KDF cartridges that last around three months on a chlorine supply; budget two to three replacements a year. The Quoss uses vitamin C sticks, which Bunnings sells only as a Special Order: $93 for a 3-pack or $141 for a 6-pack (checked 21 Oct 2026; see what Bunnings sells). Quoss says a stick lasts 2 to 4 months for a family, so you need three to six a year: about $93 to $141 a year at Bunnings prices, plus the unit.
Why intervals differ
KDF and carbon work by contact with the media surface and wear out as the surface saturates. Vitamin C is consumed in the reaction, so the cartridge empties. Chloramine supplies use up vitamin C faster than chlorine supplies do.
Set a reminder
The single biggest reason shower filters disappoint is a cartridge that was never changed. Put the change date in your phone when you install it, and buy the next cartridge with the unit so it is on hand.
Guides
Best shower filters · Chloramine water · Hard water · Installing a shower filter
Where to buy our picks
- Philips 3-stage shower filter, KDF and double meshSee today's price on Amazon
- Quoss Universal chlorine shower filterSee today's price on Amazon
Paid links: we may earn a commission. As an Amazon Associate I earn from qualifying purchases. Prices change; the shop's page is the final word.
The picks in detail
Tap a pick for its full specs, pros and cons and every shop.
Lowest running costPhilips 3-stage shower filter, KDF and double mesh
See retailer · checked 9 Nov 2026Specs, pros and cons and where to buy
KDF cartridges are cheap and last well on chlorine supplies.
- Media: KDF plus mesh stages
- Fits: Standard shower arm thread
- Reduces: Chlorine (manufacturer claim)
- Cartridge life: 4-6 months or 50,000 L (Philips claim)
Pros
- Sold and shipped by Amazon Australia
- KDF is the media with real evidence for chlorine reduction
- Fits before your existing shower head
Cons
- Cartridges need replacing every few months
- Slight reduction in flow
Paid links: we may earn a commission. As an Amazon Associate I earn from qualifying purchases. Price checked 9 Nov 2026.
Vitamin C refillsQuoss Universal chlorine shower filter
$128 at Bunnings · checked 9 Nov 2026Specs, pros and cons, all 2 shops
Vitamin C refills as a Bunnings Special Order, or on Amazon.
- Media: Vitamin C (ascorbic acid) cartridge
- Fits: Standard half-inch thread, before your head or hand-shower hose
- How to buy at Bunnings: Special Order (online or the Special Orders desk)
- Refill life: 2-4 months per stick (Quoss claim)
- Reduces: Chlorine (Quoss claim; Quoss doesn't claim chloramine)
- Certification: None shown on the Bunnings listing
Pros
- Vitamin C reacts with chloramine as well as chlorine (shown in a bath test by San Francisco's water utility)
- Bunnings takes unused items back for change of mind, in any store
Cons
- A Special Order at Bunnings, not a shelf item
- Dearest shower filter here and cartridges are pricey
- Skin and hair benefits are anecdotal; we only credit chlorine reduction
Paid links: we may earn a commission. As an Amazon Associate I earn from qualifying purchases. Price checked 9 Nov 2026.
Frequently asked questions
How long does a shower filter cartridge last?
Three to six months for a household showering daily. Manufacturers rate cartridges in litres, typically 30,000 to 40,000, which at a nine-litre-a-minute shower is roughly sixty hours of showering.
How do I know a cartridge is spent?
For KDF and carbon, the chlorine smell returns and flow may drop as the media compacts. Vitamin C cartridges simply run out; there is no smell warning, so change them by the calendar.
Can I clean and reuse a shower filter cartridge?
No. KDF and carbon are exhausted chemically, not clogged, and vitamin C is consumed. Backflushing does nothing useful.