WHAT IS GREY WATER?

Grey water is untreated domestic water that’s collected from places such as the sink and dishwasher in the kitchen, the washing machine or basin in the laundry, and the bath, shower and sink in the bathroom. In other words, it’s wastewater that’s been lightly used for household purposes but not from your toilet. Unlike sewage (or black water), which is water that comes from toilets and can’t be reused without being treated, it’s possible to reuse grey water easily in a number of ways.

The composition of grey water varies depending on its source. Wastewater from the kitchen might contain oils, fats and organic matter (such as food leftovers or vegetable peels). Rinse water from the laundry could contain washing detergent, softener and any dirt that was on your clothes. From the bathroom, grey water could contain soap, shampoo, hair, skin cells and any dirt you wash from your body.

So it’s easy to see why grey water is non-potable (not suitable for drinking). But with a bit of effort, most of this water can be used again.