Laundry detergents work better in “soft water.” Borax naturally softens hard water making almost all detergents more effective so adding 1/2 cup to each full load of washing with your normal detergent will boost your detergent greatly, resulting in a whiter and brighter wash.
The ‘hardness’ of water relates to the amount of minerals it contains, such as mainly calcium and magnesium, and to a lesser degree iron, manganese and barium salts.
The Australian scale is as follows:
|Water Type||Hardness in mg/L|
|Very hard||≥ 181|
And here is a guide to the water hardness in Australian capital cities:
|City||Total Hardness as Calcium Carbonate mg/L|
|Melbourne||10 – 26|
|Hobart||5.8 – 34.4|
|Sydney||39.4 – 60.1|
|Perth||29 – 226|
|Adelaide||134 – 148|