BioSand Water Filter

BioSand filters are technological adaptation of slow sand filtration process. While implementations exist in many different sizes and varieties, the most common design is intended for use in rural homes where naturally safe or treated water sources are not available.

BioSand filter removes 90% to 95% of organic contaminants including bacteria, viruses, protozoa, worms, and particles. After filtered , dirty water will be safe to be used for drinking , food preparation and sanitation .  Most common home-based models can produce between 20 and 60 litres of water per hour.

This kind of filter uses a clean plastic barrel to store filter and water .Gravel and sand are layered inside the filter with a PVC collection pipe situated at the base of the filter . 

The layer of sand must remain undisturbed by the flow of poured water. These conditions are achieved respectively by the installation of a diffusion plate on the top (reducing the impact of the poured water flow), filtration occurs in the lower layers of sand and gravel, which removes contaminants that cause odour, cloudiness, and taste. Then, pure water comes through the P.V.C pipes.


A 2007 study conducted by the School of Public Health at the University of North Carolina at Chapel Hill indicates that BioSand Water Filters can reduce the incidence of diarrheal illness by up to 40 percent.




Over time , the top layer of sand will clogged with other materials and will reduce flow rates . A simple stirring or skimming of the top layer of sand is usually sufficient to restore optimal flow.