Biosand Water Filters

Although there are many different methods of water filtration, Mercy Waters works mostly with Biosand Water Filtration Systems as it is very cost effective and are constructed from raw materials that can be found globally in almost every country and village.

Most BioSand Filters are constructed from concrete, though plastic barrel models have also been used. Gravel and sand are layered inside the filter with a PVC collection pipe situated at the base of the filter. Contaminated water from rain, surface, or ground sources is poured through the top of the filter and passes through a plate that diffuses the stream and blocks large contaminants (e.g. stones, large twigs, leaves).

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.

Here is a picture of a final Biosand Water Filter. BioSand Filters remove 95.0 to 99.0% of organic contaminants, including bacteria, viruses, protozoa, worms, and particles. Clean water produced by the filters is free of discoloration, odor, and unpleasant taste, and can be used for drinking, food preparation, personal hygiene, and sanitation. Most common home-based models can produce between 20 and 60 litres of water per hour.

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