In most city homes, water moves through daily life without much attention. It comes in, is used briefly, then disappears down the drain. A bath in the morning, washing up after meals, a cycle in the washing machine, and the day carries on.

However, a large portion of this water is still usable because it has been used only lightly. This is greywater. In crowded urban areas where water supplies are often under strain, reusing it can ease pressure on freshwater sources and reduce waste at the household level.

Greywater recycling simply means collecting this used water, giving it minimal treatment, and using it again for tasks that do not require clean drinking water.

What counts as greywater

Water from bathroom sinks and wash basins.

Water from showers and baths.

Water from washing machines.

Kitchen sink water, only if it is free from heavy grease or food waste.

Greywater does not include toilet waste, as........

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