APR-4N1 - 1-Micron Multi Sectional Super 4-in-1 Sediment Cartridge

Each stage of the cartridge filters a unique size of sediment.  Because the Super 4-in-1 Sediment Cartridge is multi sectional and uses gradual filtration, it can last longer than a single section cartridge. Water travels radially and enters the cartridge through FOUR SEPARATE FILTER ZONES (gradients) of specified micron sizes based on testing for enhanced filtration. Because the APR-4N1 gradually filters ALL sizes of sediment from big to small, each layer only has to filter its designated size sediment.  This is different from a single section cartridge.  See all Replacement Water Filters Microns are a unit of measurement. They refer to the size of the sediment passing through the cartridge.  The smaller the micron the smaller the sediment. A micron is a unit of length that is one millionth of a meter or 10-6 m. One micron is 1/26,000 of an inch. The APR-4N1 is our BEST VALUE sediment cartridge for its quality and durability.