BIOSAND WATER FILTER
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WE PROVIDE TRAINING OF
FILTER CONSTRUCTION & INSTALLATION, CONDUCT AWARENESS SESSIONS & SEMINARS AND PROVIDE
AND INSTALL FILTER ON DEMAND
Mr. Irfan ul Haq Shah
Welfare Agency for Socio-Economic Betterment -WASEB
Tariq Abad khanewal-PAKISTAN
cell # +923336234276 email@example.com
Mr. Zafar Iqbal
Safe Water for Better Health (The NGO World)
One billion people lack safe drinking
water.Every day they risk
their lives and health by drinking from contaminated sources: they are missing out on a basic human
right. Here the BIOSAND filter can make a difference, providing safe drinking water, right where
it's needed most: at household level, because it effectively purifies contaminated
Cheap and simple, yet effective.
Dedicated to spreading knowledge of this unique
technology, we believe this filter can make a difference, save lives, where other technology fails
or is too costly.
What is a BioSand Water
The BioSand Water Filter is an
award-winning Canadian water filtration technology developed by Dr. David Manz, a former University of Calgary
professor. BioSand Water Filters are an adaptation of slow-sand filtration, designed for use at the household
level. The filter removes water-borne bacteria, viruses, protozoa, and other organisms that cause diseases such
as cholera, typhoid fever, and amoebic dysentery. The filter also strains out the particles and organic matter
that cause cloudiness, unpleasant taste, colour, and odour.
Filters can be built on location
with local materials. The exterior is made of concrete, with gravel and sand layered inside. Rain, surface, or
ground water is poured through the top and filtered as it passes through the layers of sand and gravel. The sand
filters 1 liter of water per minute, enough to providean entire family with sufficient water for their daily drinking, cooking,
cleaning, and hygiene needs.
BioSand Water Filters are a technological adaptation of the centuries old 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 Filters remove 95.0 to 99.0% of organic contaminants, including bacteria, viruses, protozoa,
worms, and particles. Safe 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
The BioSand Water Filter (BSF) was developed by Dr.
David Manz, while a professor and researcher at the University of
Calgary, in Calgary, Alberta. BSF
development began in 1990 and has continued, involving numerous individuals and organizations that actively
develop and deploy the technology. While several commercial and community-scale implementations exist, the
largest use of BSF technology has been in the humanitarian arena. The relief organization Samaritan's Purse
has installed 70,000 filters world-wide and has recently embarked on an initiative, called Turn on the Tap
to install at least 65,000 more filters by 2010. The first large scale production of plastic biosand water
filters was begun in 2007 by International Aid Inc.; some
300,000 units are scheduled for worldwide distribution by 2010, 61,000 of which are planned for Honduras.
Most BioSand Filters are constructed from concrete,
though a new patented light weight plastic model has been tested and is being distributed by HydrAidTM for both humanitarian
and commercial purposes. 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
The top few centimeters of the sand trap the bulk
of micro-organisms, which accumulate and develop into a highly active food chain, called the Biological Layer
or Schmutzdeke. The biological layer, which must remain partially wet, traps and feeds on the
micro-organisms and contaminants in the water. Further filtration occurs in the lower layers of sand and
gravel, which removes contaminants that cause odour, cloudiness, and taste.
Over time, the top layers of sand may become
clogged with material, causing flow rates to drop. A simple stirring or skimming of the top layer of sand is
usually sufficient to restore optimal flow. Frequency of needed maintenance is dependent on the quality of
the source water. Although longitudinal studies have not been completed, Samaritan's Purse reports that
filters have remained in effective operation for over ten years.