Bio-sand filters - Clean Drinking Water for Developing Countries

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A bio-sand water filter is a simple technology which is well suited for developing countries where other clean water systems are not available. These systems cost approximately $20 per person served.

The Bio-sand filter is a container that holds sand and gravel to produce clean drinking water naturally. It is constructed of locally available materials (sand, gravel). These systems are great because they do not require electricity to work, and they do not have expensive parts to be replaced. Maintenance is simple and can be done by the bio-sand filter owner. It's so simple everyone in the household can use it.

The bio-sand filter treats polluted water with a biological layer covering the top layer of the sand bed. The "good microbes" in the bio-layer feeds off of the "bad organisms / microbes" and develop an active organic community. Organisms like worms and protozoa can't pass through the sand bed so there is a natural "die off" process that happens too. The biosand water filter can effectively filter out up to 99% of all waterborne diseases caused by bacteria, protozoa, viruses and worms, giving local families an affordable solution for their clean water needs.

A typical bio-sand filter can produce about 6 gallons or 23 liters every hour and provide enough water to meet the needs of 10 people or 3 or 4 families.



Arsenic poisoning also known as arsenicosis occurs when a person's body contains greater than normal levels of arsenic, a semi-metallic element. The naturally occurring presence of arsenic in groundwater is a major problem in parts of Cambodia and India that affects millions of rural people.

The most common signs of arsenicosis is the hardening and discoloration of skin on the hands and feet, known as keratosis or melanosis. These skin lesions are prone to infection and gangrene and in extreme cases amputation is necessary to relieve suffering. Beyond these external manifestations, arsenic consumption also increases the risk of developing various internal cancers, most commonly lung and skin cancer.

The Kanchan Arsenic Filter, Phase I Technical Report FINAL Sep08 Study has demonstrated that iron oxide or common rust has the ability to remove arsenic from water through adsorption. The arsenic becomes attached to the iron oxide and is removed from water. We have used this method of arsenic removal for our bio-sand filter and developed a construction drawing that can be used by any interested party such as non-profits, government agencies or NGOs to help provide safe drinking water in areas where arsenic levels are unsafe.

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Our goal is to bring clean, safe drinking water to low income areas. The job is big and we need your help! People in developing countries need strong advocates who are willing to work hard to help spread awareness of this water crisis. Learn how you can be the voice of people who live on less than a dollar a day. Be a Clean Water Advocate

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