Charcoal used as a water filter system is produced from coconut husk. Charcoal is used as a water filter because it easily absorbs impurities that are in the water as the water passes along it's surface. Charcoal can be used in two ways; it can either be ground into small pieces or formed into a solid and permeable block. Forming it into a block is often preferred since it makes the charcoal have a greater surface area which will remove more impurities.

Charcoal water filters are commonly used in households; actually about 95% of domestic water filters are made from charcoal, because they are simple to install, cheap and effective at removing many toxins that are found in the environment. According to the EPA (environmental protection agency), charcoal filters must be "rated" in order to remove particles that are 1 micron or larger to effectively remove the most deadly contaminants, which are Cryptosporidium (an intestinal disease in humans that can cause severe diarrhea) and Giardia (which causes parasites to develop in domestic animals and humans). An average charcoal filter will last a family anywhere between 6 and 9 months. Some charcoal filters are enhanced by the use of activated silver, which provides extra antibacterial protection. Minerals which are essential for human health are still permeable to charcoal filters, so they are also safe in this sense. Charcoal filters can also be used as filters in fish tanks and many other house held appliances. You can purchase charcoal filters at your local super market, or pet store if you wish to use one in your fish tank. For information on how to set them up, you can search on the internet, or look on the instruction manual of the product you purchase.

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