Hard water and what limescale does to your clothes
Short answer: Limescale settles into fibres and makes fabric stiff, grey and less absorbent. Dose according to your water hardness, and run a vinegar wash now and then.
What hard water is
Hard water carries a lot of dissolved limescale and magnesium from the tap. They bind to detergent, so part of it gets used up on the water instead of on the dirt. The rest settles as limescale in the fabric itself and in the machine, wash after wash, often unnoticed.
How it shows on your clothes
Clothes feel stiff after drying, whites turn greyish, towels absorb less well, and dark clothes develop a light sheen over time. These are the same symptoms as detergent overdosing, and the two actually reinforce each other if you live somewhere with very hard tap water in your home.
What you can do about it
Look up your local water hardness on your water utility's website, and use the correct dosage on the packet based on that figure. Also run a wash with a cup of white vinegar and no detergent once a month. See bamboo towels for fabric that responds well to this treatment.
Descaling the machine itself
Limescale also settles on the heating element and makes the machine slower and more costly to run over time. Run an empty cycle at ninety degrees with citric acid four times a year to keep it clean. See bamboo bedding and bamboo sheets for fabric that copes well even with hard water.
Why dosage matters so much
Most detergent packets list dosage for both soft and hard water, but many people overlook the difference and dose for the lower figure. With hard water you need more, not less, so the same amount actually reaches the dirt instead of only reacting with the limescale in the water.
Do additives against limescale help
Yes, water softening additives dosed alongside your regular detergent can help with very hard water. They bind the limescale before it has a chance to settle into the fibre. See bamboo towels, where absorbency matters most and limescale therefore shows up first out of any textile in the home.
How hard water affects colour
The limescale layer settles as a thin, pale film over the dye and can make even freshly washed clothes look slightly dull and lifeless. It is not the colour disappearing, it is the limescale sitting on top of it. A thorough vinegar wash often removes the film and brings colours back to full strength.
What about the dishwasher and other appliances
The same limescale problem affects the dishwasher, the kettle and anything else that regularly uses tap water. If you have hard water, it is worth checking whether your washing machine has a built in softener setting you can adjust, instead of only compensating with more detergent every time.
When to consider a water softener
If limescale is a major issue throughout your home, not just in the laundry, a permanently installed water softener for the whole property can be worth the effort. It solves the problem at the source rather than needing ongoing treatment. This is a larger investment, though, best judged against how hard your water actually is.
Frequently asked questions
Where do I find my local water hardness
At your water utility or local council. The figure is often listed directly on the utility's website under drinking water quality and hardness information.
Do you need descaling agent in every single wash
With very hard water, yes, it pays off. Otherwise correct dosing of your regular detergent is usually enough to keep limescale in check.
Do clothes wear out faster because of hard water
Yes, a little. Limescale crystals in the fibre act like fine sandpaper during movement and slowly wear the fabric down with every wash.
You can find the full range at Bamboo-Clothing.com.
