Some cool Water Filtration images:
Water Filtration Stone
Image by superfluity
A 19th century water filtration system, comprised of a porous stone through which water seeps while losing its impurities. (At the Convent of Santa Catalina in Arequipa.)
Rainbow Beach water filter
Image by reallyboring
The city seems to be expanding the water filtration plant at Rainbow Beach.
Image by USFWS Mountain Prairie
These filtrations systems are used to filter out agents that can potentially cause diseases (such as whirling disease) at Leadville National Fish Hatchery.
Credit: Stephanie Raine / USFWS