Though there are a variety of brands and types of water filters that can be used at home, you can rely only on a small number of technologies which ensures maximum removal of contaminants. This however does not indicate that every water filter using a specific technology is better than the other one. But it does mean that a combination of technologies can also be beneficial to remove the maximum contaminant from the water and ensure tastier and cleaner water. |
Points to be kept in mind for water filters Some filters use a collection of technologies but there are a few which are dependent only on one technology. If you want to be sure that you are going to get the best quality water with all contaminants removed, you should ensure that the water filters are certified for removing that specific contaminant by a reputable, independent agency. While some can carbon filters can remove only chloramine but others cannot.
You should also look for water filters which has NSF certified. This certification is offered by NSF which is a product evaluation company. It offers different kinds of certification based on the quality of water obtained. It may certify that a filter will make water tastier and odorless but might not give certification for complete removal of specific contaminants. You should also review the EWG water filter guide which has details on water filters which have been certified by the California Department of Public Health and/or NSF to reduce one or more water contaminants.
Using carbon or activated carbon water filters Activated carbon bonds chemically with different contaminants and removes them from the water as carbon or charcoal is porous and contaminants can get blocked by it. The extent of filtration varies from one type to another. While some only remove chlorine and improve taste and odor, the other forms might remove a variety of contaminants like asbestos, lead, mercury and volatile organic compounds (VOCs).
However, this method of carbon filters cannot remove “inorganic” pollutants like arsenic, fluoride, hexavalent chromium, nitrate and perchlorate. They are available in two different varieties carbon block and granulated activated carbon and effectiveness of each varies considerably.
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