Cleaning in Adelaide's Hard Water: Tactics That Actually Work
Limescale, white spotting, etched glass — the local conditions every Adelaide home owner deals with, and how to fight back.
Adelaide tap water sits at roughly 110–180 mg/L of dissolved minerals — well into the "moderately hard" range. That's why your kettle scales, your dishwasher leaves white spots, and your shower screen looks chalky three days after you cleaned it. Knowing the chemistry makes the cleaning much easier.
Why limescale is your nemesis
When hard water evaporates on a surface, the dissolved calcium and magnesium stay behind as visible deposits. The deposits are alkaline — which is why an acid is what removes them.
Three acids are practical for home use:
- Citric acid — cheap, food-grade, smells faint. Best general-purpose option.
- White vinegar — works on most surfaces; etches natural stone.
- Phosphoric acid (commercial limescale removers) — faster but harsher; reserve for stubborn jobs.
Bleach does not remove limescale. Surface sprays do not remove limescale. Use an acid.
Shower screens
The single highest-impact swap you can make: squeegee the screen after every shower. Five seconds. Eliminates 90% of the build-up before it forms.
When build-up has already happened, mix a 50/50 solution of white vinegar and water in a spray bottle. Spray, wait 5 minutes, scrub with a non-scratch pad, rinse. For severe cases, repeat or step up to citric acid powder mixed to manufacturer instructions.
Tap-ware and shower heads
Limescale clogs the tiny holes in shower heads, restricting flow. Unscrew the head, sit it in a bowl of warm white vinegar overnight, scrub with a toothbrush in the morning, rinse. Same trick for kitchen aerators.
Glass and mirrors
The streaks you see on glass after cleaning are often dissolved minerals from the water you used to clean. Either:
- Use distilled water (cheap, sold by the gallon at supermarkets), or
- Wipe dry immediately with a clean microfibre, or
- Finish with a flash of methylated spirits or an alcohol-based glass cleaner.
Kettles and coffee machines
Descale monthly. Citric acid is gentler than vinegar on rubber seals — fill to max line, half a teaspoon of citric acid powder, boil, leave 30 minutes, rinse twice. Do not skip the second rinse.
Dishwashers
Run an empty cycle on the hottest setting with a cup of white vinegar in the top rack. Once a month is enough for most homes; weekly if you've got severe spotting on glasses.
What not to do
- Don't use vinegar or citric acid on natural stone (marble, travertine, some granites). It etches.
- Don't mix vinegar with bleach. Toxic chlorine gas.
- Don't scrub limescale with anything abrasive on a glass screen — you'll scratch the coating.
When it's gone too far
Heavy long-term limescale on shower screens sometimes can't be removed without professional help — the mineral has bonded with the glass coating. Our carpet & specialty service team handles this on request, and we can advise whether restoration or replacement is the smarter spend.