Every clog you have ever cleared started as a film you could not see. Five minutes a month stops the film becoming crust — and it is the only maintenance most showers ever need.
Why scale keeps coming back
If your water is hard, the minerals are in every drop. No filter on the head will remove them all, and descaling does not change the water — it only removes what has already deposited. So the deposit returns, at a rate set by your water hardness and how often the head stays wet.
That is not a reason to give up. It is a reason to make the job small and frequent instead of large and rare. A monthly two-minute soak removes the film while it is still soft; an annual overnight soak removes crust that has had twelve months to harden.
The monthly five minutes
- Minute 1 — screen. Unscrew the head, pull the inlet screen, rinse it under the tap in both directions. Refit.
- Minute 2 — nozzles. Wipe a finger across the face. If it feels rough, the scale is starting. Fill a bag with vinegar and hang it on the head.
- Minute 3 — restrictor. While the head is off, hold the restrictor up to the light. A furred orifice is a clog in progress.
- Minute 4 — gasket. Look at the gasket. Flat, hard or wavy means replace it now, not when it leaks.
- Minute 5 — note it. Write the date on the inside of the bathroom cabinet door. Patterns show up in that list before they show up in the shower.
Leave the bag on for an hour while you do something else, then rinse and run. You do not need to wait for visible crust — the point of a monthly routine is that it never gets that far.
The quarterly deep clean
Once a season, take the head off entirely and soak it face-down in a bowl rather than hanging a bag on it. Full submersion reaches the faceplate edge, where scale accumulates fastest and a bag tends to trap air. Two hours in vinegar, or one hour in citric acid, then brush the face with a soft toothbrush and clear each orifice with a toothpick.
Check the hose at the same time. A kinked or delaminating inner tube restricts flow exactly like a blocked screen, and it is invisible from outside. Flex the hose through its full length and feel for a soft or collapsed section.
Know your water
Test strips cost less than a coffee and tell you what schedule you actually need. Roughly:
- Below 60 mg/L
- Soft. Annual descaling is usually enough.
- 60–120 mg/L
- Moderately hard. Quarterly deep clean, monthly rinse.
- 120–180 mg/L
- Hard. Monthly soak, and expect visible film within weeks.
- Above 180 mg/L
- Very hard. Monthly soak plus a softener or a filtered shower head.
These are broad bands, not standards, but they are accurate enough to set a schedule. If scale returns within a fortnight at the low end of the range, something else is going on — check the water heater, which can shed sediment into the hot line.
If only the hot side scales, or the scale is gritty rather than smooth, the water heater is a candidate. Annual flushing of the tank is the usual remedy, and it is a job for a plumber if you have never done it.
Habits that help
- Run the shower cold for ten seconds when you finish. It cools the faceplate and reduces the evaporation that deposits minerals.
- Leave the bathroom door open after showering. Less standing moisture means less deposition and less mould.
- Do not store bottles on the shower tray. Soap and shampoo residue feeds biofilm, which traps scale.
- Flush the system after any plumbing work. Debris from upstream is the single biggest cause of a suddenly blocked screen.
When maintenance stops being enough
Replace the head when the faceplate is cracked, the rubber nozzles are torn, or the body leaks at a seam. Those are not maintenance problems. A head that has been descaled monthly for years will still eventually lose its plating, and at that point the cost of a replacement is lower than the cost of your time.
If you are replacing it anyway, check the gpm rating before you buy — the restrictor guide explains why a like-for-like swap sometimes feels like a downgrade.
Written and reviewed by the Flow Restore editorial team. Community quotations are summarised and attributed to the thread they came from; they are not endorsements. Nothing here is a substitute for a licensed plumber's assessment.