Water conservation refers to reducing the use of water and reducing the waste of water
Water-saving technology for the home includes:
Low-flow shower heads (sometimes called energy-efficient shower heads as they also use less energy, due to less water being heated).
Low-flush toilets, composting toilets and waterless urinals, have a dramatic impact in the developed world, as conventional Western toilets use large volumes of water.
Faucet aerators, which break water flow into fine droplets to maintain "wetting effectiveness" while using less water. As a bonus, they reduce splashing while washing hands and dishes.
Wastewater reuse or recycling systems, allowing:
Reuse of graywater for flushing toilets or for the garden, and
Recycling of wastewater through purification at a water treatment plant.