#phat filter

There are two important processes going on in a filter carbon bed: One is the average time the vapor contacts the carbon, known as the mean residence time or Empty Bed Contact Time. This is equal to the volume of carbon/flow rate in volume per unit time, which equals residence time in units of time. For a given flow rate, if a filter has more carbon volume, then that filter has more contact time and will perform better. If all else is the same, the more carbon volume in a filter, the better that filter is.  This is just one reason why Phat Filters are superior to their competition; we add in more carbon than our competitors who are cutting corners on carbon volume.  Check the weight volume of the virgin activated carbon in our filters.

PHAT FILTER

#1 Brand In Nasty Odor Removal

Compare our actual test results to other filters.  Demand to see their actual test results as we show you, not some doctored version.

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Different particle sizes of activated carbon offer different flow resistance to air or water it is filtering. Typically, for filtering air or gases, the larger granule sizes are used, and for filtering water or fluids, the smaller granules sizes are used.  Granules sizes are rated by the size of the sieve used to separate the particles. A #4 sieve has holes size of 1/4 inch and therefore, accounting for the dimension of the wires which make-up the sieve, each hole is then slightly smaller than 1/4 of a inch. Similarly a #8 sieve will have holes size slightly less then 1/8 of an inch. An activated carbon sized 4 X 8 contains granules that can pass through a #4 sieve but not through a #8 sieve and will have granules ranging from slightly under 1/4 to slightly under 1/8 inch. The proportion of the larger granules vs the smaller granules can be measured by using intermediate sieve sizes. The proportions of these intermediate sizes can be used to calculate the Uniformity Coefficient, which is a measure of how the fluids would flow around the activated carbon due the distribution of the various granule sizes.Common sizes for water the particles sizes are: 
8 X 20, 12 X 40, 14 X 40 and 20 X 50 etc.

 The standard test method for particle size distribution is ASTM D2862.

http://en.wikipedia.org/wiki/Adsorption

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