A lot of the water that comes from a home or office use is not that contaminated and really is a waste of water. Grey water is the term given to water that has been used by bathing wash or cleaning areas but not toilets.
There are a few ways to recycle the water we expel and then reuse it later on. Grey water can be purified to be used on flower beds and grass or completely filtered to be used as drinking water.
A grey water system is an excellent way to become more self-sufficient and reduce your water requirements from the council or borehole water supply.
Tanks can be stored under or above ground. Water can be purified from 60% - 99.6% purity depending on your requirements or intended use for the water.