A water softener and a shower filter both deal with hard water. They don’t do the same job. A softener treats every tap in the house. A shower filter treats one outlet.
This guide sets out water softener vs shower filter for an Australian home. It covers the whole-house filter too. And it answers the question we get most: does a shower filter soften water?
We sell a shower filter. So we say plainly what it does and what it can’t do. This page is general information about water treatment. It isn’t medical advice.
How does a water softener work?
A water softener runs ion exchange. Resin beads inside the tank hold sodium. Your hard water flows through the beads. The beads take the calcium and magnesium. They give back sodium. Every tap in the house then runs soft water. The resin needs salt to recharge.
A plumber fits the unit on your main water line. It needs floor space and a drain. A brine tank sits beside it. You top that tank up with bags of salt. The resin flushes itself every few days.
A whole-home softener costs far more to buy and install than a shower filter. The salt is an ongoing cost on top. You pay for it for as long as you own the system.
Softening earns its keep when scale is wrecking things. The Australian Drinking Water Guidelines put 200 to 500 mg/L (as calcium carbonate) in the “increasing scaling problems” band. Over 500 mg/L they call it severe scaling. Between 60 and 200 mg/L they call the water good quality.
How does a hard water filter work?
A shower filter holds several media in one cartridge. Your water passes through each layer in turn. The media reduce chlorine, heavy metals and sediment. They also reduce calcium and magnesium. The filter sits between your shower arm and showerhead. It treats shower water only.
The media stack does the work. Ours holds PP cotton, stainless steel mesh, KDF-55, calcium sulfite, activated carbon, and mineral and ceramic media. Each layer has its own job. The KDF manufacturer says KDF-55 keeps working in hot water. That matters in a shower, because a softener never meets hot water at the same point.
The media matter more than the housing shape. Our guide asks: do shower filters actually work? It walks through each layer.
Our multi-stage shower filter for hard water uses that stack. Two cartridges come in the box. One cartridge lasts 2 to 6 months in normal home use. That’s about 38,000 litres, or 10,000 US gallons, on the manufacturer’s rating.
Does a shower filter soften water?
No. A shower filter isn’t a water softener. It doesn’t run ion exchange. So it can’t strip hardness out of your whole supply. It reduces calcium and magnesium at the showerhead. It also reduces chlorine, heavy metals and sediment. A softener leaves all three alone.
Plenty of sellers call these things softening showerheads. That word does a lot of heavy lifting. Ion exchange needs a resin bed and a salt supply. Neither one fits inside a shower cartridge at shower flow.
What our filter does is cut the mineral load in the water hitting your skin. We say reduces, not removes, on purpose. We won’t publish a percentage until the supplier’s lab report is on file.
That reduction may help limit limescale on the showerhead and fittings. It won’t save your kettle. Your kettle fills from the kitchen tap.
Shower filter or whole-house filter?
A whole-house filter sits on your main line. It treats every tap, shower and appliance. A shower filter sits at one outlet. The whole-house system costs far more to buy and install. It needs a plumber, so renters can’t fit one. Start at the shower if skin and hair are the problem.
Here’s the part most comparison pages skip. A whole-house filter and a whole-home softener aren’t the same machine. A typical whole-house unit runs sediment and carbon media. It cuts sediment, chlorine and taste at every tap. It doesn’t take the hardness out.
So a whole-house filter won’t stop limescale on its own. You need a softener or a scale-control unit for that. Some homes run a filter and a softener in series.
A shower filter and a whole-house system work together fine. The main-line unit handles the general load. The shower cartridge sits closest to your skin and hair, and it catches what the first stage missed.
The three options side by side
| Water softener | Whole-house filter | Shower filter | |
|---|---|---|---|
| Where it sits | Main line | Main line | Between shower arm and showerhead |
| What it changes | Swaps calcium and magnesium for sodium | Cuts sediment, chlorine and taste | Reduces chlorine, heavy metals, sediment, calcium and magnesium |
| Covers | Every tap | Every tap | Shower only |
| Chlorine | No | Yes | Yes |
| Hardness | Takes it out | Leaves it | Reduces it at one outlet |
| Fitting | Plumber | Plumber | No tools, no plumber |
| Cost to buy and fit | Highest of the three | High | Lowest of the three |
| Ongoing | Salt bags and servicing | Media or cartridge changes | Cartridge every 2 to 6 months |
| Taste at the kitchen tap | Adds sodium | Often better | No change |
| Works for renters | No | No | Yes |
What a water softener can’t do
A softener only deals with hardness minerals. It doesn’t touch chlorine. It doesn’t take out heavy metals or sediment. Chlorine is the thing most people feel first on dry skin.
It also adds sodium to every tap, including the kitchen one. Most households fit a bypass tap for drinking water. That’s more plumbing work again.
A softener is the wrong buy if your water is already soft. Sydney and most of Melbourne have naturally soft water. Check your own number before you spend anything.
What a shower filter can’t do
A shower filter treats the shower. It doesn’t treat the kitchen tap, the kettle or the dishwasher. Your hot water system still fills with hard water.
It won’t stop scale building inside appliances. It may help limit limescale on the showerhead and the fittings around it. That’s the limit of what we claim.
It isn’t a softener, and we don’t call it one. If scale across the whole house is the problem, a softener is the honest answer.
How hard is each one to fit?
A softener or a whole-house filter is a plumbing job. A licensed plumber cuts into your main line. That takes hours and it costs real money. A shower filter screws on between the arm and the head. You need no tools. Thread tape and rubber rings come in the box.
Ours fits standard 1/2-inch shower arms. That covers wall-mounted, handheld, rain and combo showers. You can install a shower head water filter yourself in a few minutes.
Renting changes the maths completely. You can take a shower filter off the arm when you move out. Nobody takes a softener out of the wall.
Is softened water safe to drink?
Ion exchange raises the sodium in your water. The sodium guidelines set no health-based limit for sodium in drinking water. They set a taste limit of 180 mg/L. Doctors should tell patients with severe hypertension or congestive heart failure when the water passes 20 mg/L.
That’s why the guidelines encourage alternative salts in domestic softeners. The sodium fact sheet says food is still the main source of sodium, not water.
If anyone in your home is on a low-sodium diet, ask your doctor first. Then ask the installer to fit an unsoftened tap for drinking and cooking.
A shower filter doesn’t raise sodium anywhere. Nothing changes at your kitchen tap, because the filter never touches it.
Which one should you choose?
Start with your hardness number and your lease. A softener suits a hard water home you own, with scale damaging appliances. A shower filter suits skin, hair and chlorine problems, and it suits renters. A whole-house filter suits owners who want better water at every tap.
SA Water says more than 200 milligrams per litre counts as hard water. Your own retailer publishes a figure for your supply zone. That figure, not a sales page, decides whether softening is worth it.
A water softener makes sense if:
- Your supply sits in the scaling bands and scale is damaging appliances
- You own the home and plan to stay
- You have space, a drain and no problem buying salt
- You accept a bypass tap for drinking water
A shower filter makes sense if:
- Dry skin, rough hair or chlorine smell are your main complaints
- You rent, or you don’t want to touch the plumbing
- You want the change this week, not after a plumber books you in
- You want to try filtered water before committing to a bigger system
A whole-house filter makes sense if:
- You want sediment and chlorine handled at every tap
- You own the home and you’re already doing plumbing work
- You understand it won’t fix hardness on its own
If the shower is where hard water bothers you, start there. Our shower head filter in Australia fits standard arms and ships with two cartridges.
Last reviewed September 2026 by Lena Hartman
Health note: this article is general information about water treatment. It isn’t medical advice. A shower filter isn’t a medical treatment for eczema or any skin condition. If you have a diagnosed skin condition, consult a dermatologist. If you’re on a low-sodium diet, ask your doctor before you soften your drinking water.
Data note: the hardness bands and the sodium figures come from the Australian Drinking Water Guidelines. Open the linked pages for the current wording before you act on them.
Frequently Asked Questions
Is a water softener better than a hard water filter?
Neither one wins on its own. A softener treats hardness at every tap and needs a plumber and salt. A shower filter treats one outlet, and it also reduces chlorine, heavy metals and sediment. Pick the softener for house-wide scale. Pick the filter for skin, hair and renting.
Do water softeners remove chlorine?
No. A softener swaps calcium and magnesium for sodium through ion exchange. It doesn’t filter chlorine, heavy metals or sediment. Chlorine is often what dries your skin in the shower. You need filtration media for that job, not resin beads and salt.
Can I use a shower filter instead of a water softener?
Yes, if the shower is where you notice the problem. A shower filter reduces chlorine, heavy metals, sediment, calcium and magnesium at the showerhead. It won’t soften water at other taps. It won’t protect your kettle or your washing machine either. For skin and hair, it does the job.
Do I need a shower filter if I already have a water softener?
Many people run both. A softener deals with hardness but leaves chlorine in the water. A shower filter reduces chlorine, heavy metals and sediment before the water reaches your skin. The two units sit in different places, so they don’t fight each other at all.
Can renters install a whole-house water filter?
No. A whole-house filter or softener needs a plumber to cut the main supply line. Most leases don’t allow that work. A shower filter screws on between the shower arm and the head, so it needs no permission. You can take it with you when you leave.
Should I get a shower filter or a whole-house filter first?
Start with the shower filter. It costs far less, fits in minutes and needs no plumber. It treats the water you stand under every day. Add a whole-house system later if you want every tap covered. Both keep working when you run them together.