What makes coal a good water filter?



  1. 0 Votes

    It’s actually charcoal, not coal, that is used for filtering water (although it can be derived from coal). It’s basically just carbon but it makes an effective water filter because of its unique chemical structure which causes carbon-based impurities and some other impurities such a chlorine to bond with it. This isn’t effective in filtering some chemicals such as nitrates or sodium.

  2. 0 Votes

    Activated Charcoal (AC), not coal. AC works by absorbing impurities in its interstitial pores and rendering them immobile. It is not however capable of filtering pathogens…for that you need chlorine, ozone or UV light.

  3. 0 Votes

    Simply put, Coal attracts carbon impurities like chlorine. A good carbon activated filter will remove over 99% of chlorine and its by products.

  4. 0 Votes

    Anthracite coal is used in rapid sand filters. Activated Charcoal can also be used. Rapid sand filters are the most common type of water filter. There is a layer of the coal on top of the sand.

    Anthracite coal is 92.1-98 % carbon, very dense and has a low percentage of volatile matter. I think the large percentage of carbon, surely increasing the surface area for bonding, is what makes it good for filtering, but also expensive.

    I do not know for sure but I think they are most often used in large scale water filters.

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