Installing a shower head filter takes about five minutes. You need no tools and no plumber. The filter screws between your shower arm and your showerhead. It fits standard 1/2-inch shower arms. This guide walks through shower filter installation step by step. It then covers the three things that go wrong: leaks, bad thread tape and weak flow.
One question comes first for some readers: how do shower filters work? That guide covers the media inside the cartridge. This page covers the fitting only.
Will a shower head filter fit your shower?
Almost certainly, yes. Australian shower arms use a standard 1/2-inch BSP thread. Wall-mounted, handheld, rain and combo showers all use it. If your showerhead unscrews by hand, your thread is standard. A small number of imported designer arms differ. Check the thread before you buy.
The filter sits in the gap between the arm and the head. Nothing else changes. Your own showerhead goes back on the front. That layout has a name. Ours is an inline shower filter, so the pipework inside your wall stays untouched.
Check your thread in 30 seconds
Look at the male thread on the end of your shower arm. A 1/2-inch BSP thread measures about 21 mm across the outside. It’s not 12.7 mm. The half-inch name comes from the old pipe bore, not from the thread itself. Your showerhead packaging may print it as G1/2. Both names mean the same thread.
Renters can check this without a tape measure. Unscrew the showerhead by hand. If it comes off with finger pressure, you have the standard fitting.
Check your headroom too
The filter adds length between the arm and the head. On a fixed wall arm, your showerhead ends up slightly lower and further out. Stand in the shower and look at the gap above your head. Tall people in older bathrooms should check this first. A rail-mounted handheld keeps its headroom, because the filter sits down at the wall arm.
What comes in the box
- 1x filter housing
- 2x multi-stage filter cartridges
- Rubber sealing rings
- Thread sealing tape
You buy nothing extra. The thread tape and the rubber rings do the sealing between them.
What to do before you start
Turn the shower off at the tap. Put a dry cloth on the floor of the tray.
Then check one thing. Grip the shower arm and twist it gently. It shouldn’t move in the wall. A loose arm is the most common reason a brand new joint drips. Fix the arm first if it moves.
Take a photo of the current setup on your phone. It helps if you ever want to put things back.
How to install a shower head filter, step by step
Step 1: Take off your showerhead
Unscrew the showerhead from the arm. Turn it anti-clockwise. Most come off by hand. Grip it with a cloth if it’s stiff, then twist gently. Don’t reach for a wrench. You can crack the fitting.
Step 2: Clear the thread
Peel off every scrap of old thread tape. Wipe the thread with your cloth. Fresh tape needs a clean surface to grip.
Step 3: Wrap the shower arm thread
Take the tape from the box. Wrap it clockwise around the arm thread. Three to four turns is enough. Keep it tight and flat. Clockwise matters, because anti-clockwise tape unwinds as you screw the housing on.
Step 4: Screw the housing onto the arm
Turn the housing clockwise by hand. Hand-tight plus a half turn is enough. Don’t force it. The housing is plastic, so extra torque cracks it rather than sealing it.
Step 5: Drop the cartridge in
Open the housing. Put one cartridge in. Close the housing. Keep the spare cartridge in the box for later.
Step 6: Wrap the housing outlet thread
Wrap tape clockwise around the outlet thread on the front of the housing. Your showerhead goes on here. Same as step 3: three to four turns, tight and flat.
Step 7: Put your showerhead back on
Screw the showerhead onto the housing outlet. Hand-tight plus a half turn, again. Line the head up where you want it before the last quarter turn.
Step 8: Flush the new cartridge
Run the shower for 30 to 60 seconds. This washes out media dust from the fresh cartridge. The water can look cloudy for a few seconds. That’s normal, and it clears fast.
How long does the install take?
About five minutes for most people. Taking the old showerhead off takes a minute. Wrapping the two threads takes about two minutes. Screwing the housing and the head on takes a minute. Flushing the cartridge takes the last minute. A seized showerhead is the only thing that adds real time.
You’ll see a two minute figure on some pages. That’s optimistic, and it assumes your old head drops off in your hand. Five minutes is the honest number. We use five minutes everywhere on this site.
Do you need a plumber to fit a shower filter?
No. Nothing gets cut, glued or soldered. The filter screws onto a thread that’s already there. You break no seal inside the wall. A whole-house system is the opposite job, because it needs pipework and a licensed plumber. That gap in effort is why most people start at the shower.
Read shower filter vs whole house filter to see the two options side by side. It covers the plumbing, the coverage and the upkeep.
Why does a new shower filter leak?
Bad thread tape causes nearly every new leak. Tape wrapped anti-clockwise unwinds as the joint goes on. Too few turns leave a gap for water. The fix is the same in both cases. Strip the old tape off, wrap fresh tape clockwise, then hand-tighten again.
Do it in this order. Turn the water off. Unscrew the joint that drips. Pull all the old tape off the thread. Wrap four to five turns this time. Screw it back, hand-tight plus a half turn. Run the shower and watch the joint.
Still dripping after two goes? Check the rubber sealing ring. It sits flat inside the fitting, and it can move while you’re twisting. Seat it properly and try once more.
A leak that survives all of that is usually not the filter. It’s the arm moving in the wall.
Why is my shower pressure low after fitting a filter?
Usually it isn’t the filter. Your showerhead sets the flow, not the housing behind it. A water-efficient head runs as little as 5 litres a minute by design. Supply pressure also drops at busy times of day. Test your supply at the water meter before you blame the new filter.
Start with the head you screwed back on. The Australian Government’s Your Home guide says an inefficient showerhead uses 15 to 25 litres a minute. A WELS 3-star head can use as little as 5 litres a minute. So the head in front of the filter decides most of what you feel.
Then look at the time of day. Water Corporation says household pressure can be lower between 6am and 9am and between 6pm and 9pm. Many homes draw water in those two windows. Distance from the service reservoir changes it too.
You can measure the supply yourself in a minute. Sydney Water’s water pressure test uses your meter. Turn everything off, read the meter, run the front garden tap for one minute, then read it again. Their standard treats 18 litres a minute as the minimum. A lower number means the problem sits upstream of your bathroom.
A full cartridge is the other cause. That flow loss builds up over weeks though. It doesn’t appear on day one.
Install problems and what they mean
| What you see | Likely cause | What to do |
|---|---|---|
| Drip at the arm joint | Tape wrapped the wrong way, or too thin | Strip it, wrap four to five turns clockwise, hand-tighten |
| Drip at the showerhead joint | Rubber ring out of place | Open the joint, seat the ring, refit |
| The whole arm turns as you twist | Shower arm loose in the wall | Fix the arm, then refit the filter |
| Weak flow from the first shower | Showerhead flow rate or supply pressure | Test at the meter, then check the head |
| Flow drops after some weeks | Cartridge is full | Swap the cartridge |
| Cloudy water at first | Media dust in a new cartridge | Run the shower 30 to 60 seconds |
| Housing cracks or won’t seal | Over-tightened on fitting | Hand-tight plus a half turn only |
What to expect after the first shower
The filter works from the first minute. Nothing needs priming and nothing needs soaking.
Some people notice the chlorine smell go in the steam. Some notice the water feels different after a few days, as the media settle. Our filter reduces chlorine, heavy metals and sediment. It also reduces calcium and magnesium in the water reaching you. It may help limit limescale on your showerhead and fittings.
The cartridge is rated at about 38,000 litres by the manufacturer, which is 10,000 US gallons. In normal home use that lands between 2 and 6 months. Your water hardness and the number of people in the house decide where you land.
Two signs tell you the cartridge is done. The chlorine smell comes back. Flow drops even after you clean the showerhead. Our guide on when to change a shower filter goes through every sign and the swap itself.
Write the fitting date on the housing in pencil. It’s the cheapest reminder you’ll ever set up.
Five minutes and one roll of tape, and the water hitting your skin is filtered. Fit a shower head filter yourself this weekend. Two cartridges come in the box, so the first swap is already covered.
Last reviewed September 2026 by Lena Hartman
Disclaimer: this guide covers fitting a filter onto an existing shower arm. It’s not plumbing advice for pipework inside your walls. A shower filter is not a medical treatment for eczema or any skin condition. If you have a diagnosed skin condition, consult a dermatologist.
Common questions
Can you fit a shower filter to a handheld shower?
Yes. A handheld hose screws onto the same 1/2-inch thread. Fit the filter to the wall arm first. Then screw the hose onto the filter outlet. The handset works exactly as before. Rail-mounted handhelds keep their headroom, because the filter sits down at the arm.
Does the filter go before or after the showerhead?
Before. Water has to pass through the cartridge first. The filter screws onto the shower arm, and your showerhead screws onto the filter. Fit it the other way round and unfiltered water reaches your skin. That order is the whole point of an inline design.
Do you need thread tape if the joint has a rubber ring?
Yes, use both. The rubber ring seals the flat face where the two parts meet. The tape seals the thread itself. Skipping the tape is the most common cause of a slow drip. Three to four turns is enough on a clean thread.
Can you move the filter to another shower?
Yes. Unscrew it, strip the old tape off both threads, then wrap fresh tape. The housing moves fine. Renters do this when they leave a place. Check the rubber rings before you refit. A squashed ring seals worse the second time, so swap it.
What if your shower arm turns in the wall?
Stop and deal with the arm. A shower arm should sit firm in its wall fitting. If it turns with the head, the joint behind the tiles is loose. Screwing a filter onto a loose arm just moves the leak. A plumber can reseat the arm quickly.