Raw sewage can be treated until it becomes quite pure.
![Vials of water, raw sewage to reclaimed water, showing purity.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/wss-wuse-reclaimed-wastewater-vials.jpg?itok=ETepY5mu)
Detailed Description
Sequence of reclamation from left: raw sewage, plant effluent, and finally reclaimed water (after several treatment steps)
Sources/Usage
Wikipedia: Creative Commons License