Water Filtration - Class Rating

Water filters are rated by "Class". This refers to the ability of the filter to reduce/remove different size particles or chemicals found in the water. We are providing the definitions of various water filtration Class ratings below.

Understanding Water Filtration Class Ratings

Particulate

Class I - Particles 0.5 to 1 micron in size

Class II - Particles 1 to 5 micron in size

Class III - Particles 5 to 15 micron in size

Class IV - Particles 15 to 30 microns in size

Class V - Particles 30 to 50 microns in size

Chlorine

Class I - Reduction of 75% or more

Class II - Reduction of 50 to 75%

Class III - Reduction of 25 to 50%

1 micron = .001 millimeters or .0039 inches. For example, human hair equals 30 to 150 microns.

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