Water Filtration for Household Purpose

These filters produce small amoimts of water per day to meet the daily needs of 25 to 30 litres per person. Use of clay pot filters is a very well known old process. 

A paste with mixture of the clay and saw dust (of about 20 micron size) with different proportions (depending on the plasticity of clay used) is given the needed shape and fired to make it hard porous solid ready for filtration. This very simple type filter can only filter out the particles and colour out of water but is unable to remove bacteria. 

These rely on the small pore size of the ceramic material, are inexpensive and more effective water filter, to filter dirt, debris, and bacteria, protozoa, and microbial cyst etc. out of water. But again, this is not effective against viruses since they are of smaller size than the pores and can pass through to the other clean side of the filter. To overcome this, CWF are treated with silver in a form that will not leach away helps to kill or incapacitate bacteria and prevent the growth of algae in the body of the filter. 

A high-performance activated carbon core inside the ceramic filter cartridge is used that reduces oiganic and metallic contaminants and some chemical compounds such as chlorine etc. for the absorbing property of Active Carbon. These filters need to be replaced periodically because the carbon becomes clogged with foreign material. 

CWF systems consist of a porous ceramic filter that sits on top of a plastic or ceramic receptacle. Contaminated water is to pass through the filter into the receptacle below. The receptacle usually is fitted with a tap. 

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