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Each area has a water committee who ensure correct use and maintenance of the pots. They help organise the training events which spreads filter building skills and gets the water filtering embedded into the community.

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How Does it Work?
River water is emptied into the upper pot which, through a small hole, allows it to slowly trickle into the larger pot. Every drop of water dripping into the reservoir of water held in in the large pot causes a drop of water to drip out of the hosepipe, as shown. The water coming out of the hose must have passed though the sand. Larger stones at the base of the pot provide spaces in which filtered water collects. The cleaned water flows up the hose as more water is added to the pot.


The river water often contains bacteria that cause illness. The filter acts to remove these in four ways.

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    The filter physically traps dirt in the top few inches of sand,

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    Microbiological life builds up in the sand layers, larger bugs eat smaller ones. Some of the ‘bad bugs’ die in this way.

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    The grains of sand become coated in a sticky blanket. Bacteria and even viruses stick and become part of the layer.

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    It takes time for the water to pass through the system. Certain bugs, eg Cholera, do not live long enough in open water make it to the exit!


Sand Filters Are A Cheap Solution.

Sand filters clean water from biological contaminants, such as E.Coli, Cholera, or physical contaminants such as suspended mud, etc. They are not proof against chemical contamination and do not work with salt water. They are unlikely to be of value in environments prone to freezing.

They need at least one bucket of water each day as through put, so would not be ideal in situations where the water supply was so intermittent as to make this impossible. They take six week to initialise and so are not an "instant" solution in the sense that a charcoal filter might be. Sand filters do not provide the "buzz" associated with the provision of a technically advanced clean water solution.


Future Events
IIn August 2018 a team from New Mills will be visiting Kasese near the copper mines in Kilembe to help with training and to help test the local drinking water