Phat vs. the other guys

Companies like to talk about their carbon being the best without any real hard scientific proof... until now. Phat Filter has scientifically proven that it has the best carbon on the market, and you can see the results from a carbon test conducted by a leading independent, certified USA carbon laboratory right here. No tricks, no partial truths, just facts. The numbers don’t lie.

Let’s finally put to rest the nonsense about carbon being half the weight and lasting twice as long. It simply isn’t so. It isn’t scientifically possible and it has been used to lure people into buying lighter weight filters while duping them into believing the filter would last longer. If you have half the carbon weight by volume, you have half the capacity to filter—period. More usable carbon by volume means a higher capacity and longer sustainability. Lighter is NOT better. Phat Filter doesn’t skimp on filter bed depth and tells the truth about filter bed length. It is really easy to make claims about a lightweight filter when you don’t rely on facts or science. Phat Filters are heavier than other Virgin Activated Carbon filters because Phat uses more carbon in the same space and a higher grade carbon throughout that space. Carbon weight does count and adsorption yield is the key to a better filter.

Phat Filter buys a higher grade carbon, a larger grade carbon, and a harder carbon than the other companies claim.

Two of the four brands tested are buying super cheap carbon and the testing results show this.

One of the four brands tested is using less carbon in their filters than the other three brands.

Adsorption yield is the key to buying good carbon and a great filter. The highest adsorption yielding carbon on the market is Phat Filter’s carbon.

Phat filter consistently makes the longest lasting, best filtering carbon filter on the market which is why it's the number one choice in nasty odor removal worldwide.



Brand C

Brand R

Brand P

Virgin Activated Carbon Yes Yes Yes Yes
4-6 Mesh Size Carbon Yes No No No
The Largest Size In The Industry 92.99% 10.60% 7.35% 48.55%
Particle Size Distribution-
Effective Size in MM
3.53 1.94 1.81 2.62
Filter Bed Thickness of 2 inches Yes Yes Yes No
Filter Length Specified On Label
Equals Actual Carbon Bed Length On Filter
Yes Yes Yes No
Ball-Pan Hardness of Carbon 97.95 91.81 77.59 90.57
Dry Apparent Density of Carbon in g/cc 0.455 0.401 0.361 0.382
Butane Number g/100 g of Carbon 20.9 22.1 25.0 24.4
Adsorption Yield = Filter Capacity:
How Much (by density) X How Good
.455 X 20.9 = 9.51 .401 X 22.1 = 8.86 .361 X 25.0 = 9.02 .382 X 24.4 = 9.32


Virgin Activated Carbon: Virgin: Never been used before. Activated: Carbon is activated by steam or high temperatures; the objective is to knock ash from the pores of the carbon. Some manufacturers claim double/triple activation; this does NOT increase the capacity to retain odor, in fact it lessens it. Multiple activation decreases the weight of the carbon by breaking internal fissures, this process in turn decreases the carbons ability to filter air.

Mesh Size: The smaller the mesh, the larger the carbon. Phat is the largest in the industry; this increases its ability to retain odors.

The Largest Size in the industry: Percentage of the largest carbon mesh (piece) size in the industry 4-6 mesh. (The smaller the mesh, the larger the piece of carbon)

Filter Length mentioned on label: Brand P is selling their filters as everyone else in the industry is 4x8, 6x24, 10x24. . . etc. However, their measurements include the 2” flange, all others on the market sell each filter as 4x8, 6x24, 10x24. . . etc., plus a 2” flange. This means the user is getting 2” less of filter and carbon than others.

Ball Pan Hardness: This is a test in which a metal ball measures the hardness of the carbon by smashing it. The harder the carbon, the better/more effective.

Butane Number: This is a standard test to determine carbon capacity. With a quick look at this the user would assume the higher the number the better. In some cases this is true, however our users are using these filters for organic odors, the most difficult compounds to trap, and this means you need the smallest pores (spaces) to capture those odors and Phat has the highest amount of the tiniest pores as our test clearly show.

Adsorption Yield: the higher the number the better the filters ability to remove odor.