Water filter

During filtration, water passes through filters, some made of layers of sand, gravel, and charcoal that help remove even smaller particles.

A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools.

To make an artisanal water filter, one must be aware of three risks associated with unclean water: biological (bacteria and viruses) and chemical (including heavy metals and others toxic minerals).

Basic filter making

While most biological risks can be avoided through boiling water, chemicals are not affected by heat and must be captured by charcoal, ideally activated to improve surface activity. To protect the charcoal from bigger particles such as silt, clay and sand, one can use a filter, made from alternating layers of gravel, sand, with a paper or cloth to hold any particle. A ceramic filter can also be used.

Dependencies

• Water
• Water filter
  • Charcoal
  • Gravel
  • Sand

See also

• Ceramic water filter
• Food preservation

References

This article uses material from the Wikipedia article Water_filter, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors).