Water can be classified by the amount of dissolved salt content (salinity)
It’s usually measured in parts per thousand (ppt).

By decreasing the need for freshwater and removing pollutants in used water returning to the environment, we can improve the availability of water. Water is a shared resource that can be part of a circular economy. This circular approach helps ensure water is suitable for reuse at the next stage of its journey. Improving wastewater treatment is a vital step towards joining(/developing?) a circular water economy