Conventional Filtration

Filtration is a part of the water treatment process in which colloidal and suspended material is removed from water by passage through layers of porous media like sand, foam, or fabric. After a while, these materials build up in or on the surface of the media, so the filter needs to be cleaned. This is usually done through backwashing, sending clean water backwards through the filter medium to dislodge particles. Here are two examples of conventional filtration plants in Honduras:

...