Make sure you choose a detergent that is suitable
for the fabrics, soiling and colours in your wash load: detergents
are available especially for your machine type, water temperature
and fabric type. Click for tips on
choosing a laundry
Follow the dosage instructions on the package as a
guide. Take into consideration:
Water hardness: more detergent if
the water is hard.
Wash load size: more detergent
if you have a large capacity machine.
Wash load soiling: more
detergent if you have a heavily soiled load.
lead to incomplete soil removal, or transfer of dirt from heavily
soiled items onto other items (“greying”).
is wasteful of detergent, adds unnecessarily to the levels of detergent
ingredients in wastewater, and can lead
to detergent residue on clothes.
What is water hardness?
Water hardness is a measure of dissolved calcium and
magnesium in water (in milligrams per litre). A simple test of water
hardness is to see how well a lather forms. Add some detergent to the
water and agitate. Lather will form easily in soft water but not in
Water hardness depends on the source of the water:
Rainwater is very soft.
Bore water is typically hard, but varies
around the country.
Reticulated water varies around the country.
Typical levels of water hardness in major cities are shown below. Your
local water authority may be able to give you more information on water
hardness in your local area.