Do you mean waste water? Sewage water from humans contains Phosphorus and Nitrogen, 2 of the essential nutrients for life and for plant growth. For a long time, humans used their waste water to fertilize their crops. These days we could afford to look into utilizing such a system again.
Water itself is an essential nutrient.
Without it human life cannot survive. Water deprivation kills faster than lack of any other nutrient.
It is seldom considered a nutrient. Many people don’t realize the important part water plays in major body functions.
Water is present in the mucous and salivary juices of our digestive systems. This is especially important for moving food through the digestive tract. Persons who experience reduced salivary output soon will realize that foods taste differently and are harder to swallow. As a lubricant, water also is helpful for smooth movement of bone joints.
Evaporation of water from body surfaces also helps cool the body. Sweat loss that is barely noticeable occurs every day and night. Individuals may lose up to a pint of water each day in this manner. In hot, humid weather or during exercise, increased sweating and losses of water are more visible.
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