CARBON FILTRATION is a method of filtering that uses activated carbon to remove chemicals (such as chlorine, volatile organics and others) and some bad tastes and odors from water. Carbon filters are also components of reverse osmosis systems to remove chlorine from water prior to flowing to the systems’ membrane which can be negatively affected by the chlorine.
How does it work?
With a carbon filter process, water passes through activated carbon, which is porous, trapping certain particles that are attracted to the porous material in a process known as adsorption.
At some point, adsorption capacity is exceeded and the filter must be changed in order to be effective. Coal is the most common element used to produce carbon filters, but manufacturers will often enhance carbon filters by using other elements and blends of materials in their designs such as coconut shell and other materials. These materials are “baked” at extremely high temperatures creating very large numbers of pores within the materials, giving them large capacities for the adsorption process. This “baking” is the “activation” process that makes these materials so effective at removing certain impurities from the water.
Such layered filters are considered more effective since they have the ability to filter smaller particles from the water. Effectiveness really depends on what the filter is designed to achieve in filtering out waterborne particles. Carbon filters vary in size, design, intensity, function, efficiency and life cycle and different activated carbon filters are designed to allow a certain flow rate of water through the filtering process as well.
Carbon Filtration Effectiveness
Carbon filter effectiveness is measured in terms of size of particles they can attract.
I.e. 1 micron, 5 micron, 10 micron, etc.
The highest number is the least effective and the smallest number is the most effective.
There are typically two ratings to determine the effectiveness of carbon filters. They are as follows:
Nominal Filter rating – a filter that will remove 85% of the particles of a specified size (in microns) and larger. A filter rated at 1 micron will remove 85% of particles that are 1 micron or larger.
Absolute Filter rating – a filter that will remove 99.9% of particles of a specified size (in microns) and larger. A filter rated at 1 micron will remove virtually all particles 1 micron or larger.
Carbon filtration can help remove harmful chemicals from your water and H2O Care can install an under-sink water filter, whole house water filter, an under-counter water filter or any other solution that will solve your specific situation. Give us a call at (800) 539-1100 or contact us here.