Prefilters play an important role in your filtration as they generally have a larger pore size, and are intended to catch larger particles like dirt or sediment. This allows your more specialized filters to do their job in catching those smaller contaminants to you don’t want in your water!
Carbon Water Filters have been used for centuries to filter impurities from drinking water. Carbon is a very powerful absorbent; one pound (half a kilogram) of carbon contains a surface area of 125 acres (0.5 square kilometers). The material has millions of tiny pores, usually invisible to the eye, and can absorb thousands of water contaminants. Granular Activated Carbon (GAC), and Carbon Block are two methods of carbon filtration.
Activated Carbon is a material that has a positive charge, which helps attract even more impurities. Generally, Carbon Block Filters ( or "charcoal water filters" ) have higher contaminant removal capability than GAC filters, and they usually have a higher cost. Activated Carbon and "Block" Filters a usually rated by size of the particles it can remove. Typical ratings are from 50 micron (least effective) to 0.5 micron (most effective). Flow rate through the filter is slower the smaller you go. However, there are some applications where granular carbon is a better fit, such as in removing chloramines (combined chlorine).
Pleated filters are the best method for filtering dirt, sand, silt and sediment or can be used as a pre-filter for a high volume system. Pleated filter cartridges are available in cellulose, polyester, and cellulose-polyester blend. These outperform other depth type sediment filter elements because they have dramatically increased surface area, which means they deliver much longer life. Lower pressure drop (another significant advantage of pleated filters) allows for increased flow rates and the use of smaller filter housings to reduce equipment costs. They are most appropriate for use when high efficiency filtration and economy are crucial.
Scale buildup caused by hard water corrodes and restricts water flow in pipes. In water heating appliances, such as boilers, coffee machines, or water coolers, the reduced flow causes insufficient heat transfer to the water. This not only leads to inadequately heated water, but also to overheated metal components on your appliance, which may present a safety hazard to your home or business.
Reverse Osmosis process is a modern day advancement in water purification. The core of the process is a reverse osmosis membrane with tiny pores. When water gets pressured through it, membrane produces two outputs: clean water that's pure enough to have very few contaminants left, and a "dirty" output that in drinking water applications is typically discarded down the drain. Since pressure was used , and membrane pores are tiny to let only very small size molecules (like H2O) through, any impurities that are larger molecules will be rejected by it.
Inline filters can be installed on any water line where filtered water is desired. They are small, compact, and the entire unit is disposable. This type of unit can be used behind a refrigerator or ice machine where there is minimal space available.