20 x 2.5 Inch Replacement Filters
The 20 x 2.5 inch cartridge sits between the compact 10 x 2.5 inch undersink filter and the large-format 20 x 4.5 inch Big Blue whole house cartridge. It's the right choice for undersink and point-of-use systems that need more capacity than a 10-inch filter provides — delivering longer filter life and lower replacement frequency without stepping up to a full whole house housing.
This mid-size format is common in multi-stage undersink setups, RO pre-filter stages, and slim-line systems where the 4.5 inch diameter would be too bulky.
Media types available in this collection:
- Sediment — Pentek P5, Purtrex, and Watts FPMB5 spun polypropylene in multiple micron ratings
- Carbon block — Pentek EP and EPM for chlorine, taste, and odor reduction
- GAC — Pentek RFC and C1 granular activated carbon for broader chemical reduction
- Specialty — Pentek NCP series and 3M Aqua-Pure AP110-2 for compatible OEM systems
Prices range from $10 to $55 depending on media type and brand. All cartridges fit standard 20 x 2.5 inch housings.
Not sure which media type or micron rating your system calls for? Call 1-800-277-3458.
