POST FILTER 20" - Used as the final polishing filters in our water filtration systems. Dual gradient filter with a 25 micron rating on the outer half and 1 micron rating in the inner core of the filter. These filters are designed for high holding capacity with less friction loss compared to a standard single micron rating pleated cartridge filter.

Made from 100% pure polypropylene and are sized for use in 4.5" x 20" Big Blue^® filter housings.