I was looking around my local hardware store today and came across some water purifier filters which had activated carbon. One said that it filtered out taste and 'odour'. Has anyone used these or know if they would work just pushing air through them? Or will it just remove odour from water? The photo is pretty much what im talking about.

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filtering air and water is different, i suggest you use a product designed for air scrubbing if odor control is a issue

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it will work but not very good, the carbon is packed very loosely in those so the water can pass and sediment can collect, thats why if you take a new water filter and shake it you will hear the stuff inside and if you shake a used one it will sound solid

Fat sam is right, with water carbon filters there will not be as much carbon available because the water must pass through it so there must be spaces between the carbon that allows the water to freely flow through, but also the carbon must be dense enough to grab certain pollutants. When you do not use the water carbon filter for air, much more carbon is available to bond with odor particles because air is composed mostly not of molecules, but of elements, namely nitrogen (~80%) and oxygen (~20%). Nitrogen and oxygen cannot easily fit between the carbon molecules in an air filter because the carbon is very dense, but water, because it is a larger molecule, cannot pass through this tightly packed carbon. The reason that retailers offer both kinds is that water carbon filters are more economically viable because they use less carbon. They do this with simple science. Water is polar and thus attaches to elements and increases the size, thereby making it plausible that less carbon is inside the filter. The only way water carbon filters will increase efficiency of odor control is if they are used IN WATER! Any air filtration should consist of air filters due to the physical properties in them that seperate them from water filters.

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