The Quran specifically mentions water as the basic element of life. Indeed. Allah Taala says in the Quran:
''... And We made from water every living thing.'' (Surah al-Anbiya, 30)
Scientific experiments have shown that water is the main element of the human body, accounting for seventy-six percent. Water is also the main element of all other living things. Herbs also cannot be imagined without water. One kilogram of sugar requires one thousand liters of fresh water and one kilogram of wheat requires one and a half thousand liters of water to produce. The same is true of industry. For example, it takes four liters of water to produce one kilogram of steel, and so on.
Rasulullah peace be upon him was very economical in performing wudu and ghusl. We the believing slaves should follow the example of Muhammad Mustafa peace be upon him in the efficient use of water as in all things.
Abdullah bin Umar radiallahu anhu:
The Messenger of Allah peace be upon him passed by Sa'd when he was performing wudu, and said: 'What is this extravagance?' Sa'd said: 'Can there be any extravagance in ablution?' He peace be upon him said: 'Yes, even if you are on the bank of a flowing river.'"
It is not permissible to waste water. But when we look at the realities of life, we see the opposite: overuse of water, instead of saving as much as possible.