SKU: FI-CK5320


Sale price$17.00 USD

  • 1 Micron Carbon Block for Cysts, Chlorine, Taste & Odor Reduction
  • Size Starts from 6" Length by 2.5 Inch Diameter Filter Sizes
  • Durable Injection-Molded Polypropylene Cap & Body
  • Designed to fit Existing Bayonet-Style Permanent Heads
  • Spin-Welded Construction Ensure a Reliable, No-Leak Seal
  • Affordable Alternative Cartridge for Cuno, 3M Aqua-Pure & Bunn Systems
  • Constructed of 100% NSF Approved Materials
  • Made in USA Made in USA


OMNIPURE's CK-Series Carbon Block 1 micron filter cartridges are designed to be affordable alternative replacement filters for CUNO and 3M Aqua-Pure water systems which use existing bayonet-style permanent heads. These filter bodies offer equal or superior filtration capability at a considerably lower price than comparable replacement bodies on the market. CK-Series filters use activated carbon media which has been specially treated to effectively remove cysts, chlorine, taste and odors, and they are a great value for applications where long life, high purity and low change-out frequency are required. No glues or binders were used in the manufacturing process but instead, components are friction-welded together producing a reliable, no-leak seal. These filters are available in a variety of sizes and can be used to service water filters, coffee machines, ice-machines, drinking fountains and in any applications where better tasting water is important.

Specification Table

APEC Item Code


Manufacture Item Code


3M CUNO Equivalent Item Codes


Filter Length

From 2.5” x 6” to 2.5 Inch x 14"

Service Life Gal. or 1 year

From 1500 Gal to 3500 Gal

Compatible Cartridge Alternate Part Numbers

CK Connection Head
  • 3M/CUNO OCS: 55866-05, 55866-06, CS-51, CS-52, EVOLFLTR10, 700200002518, CS-452, CS-450, OCS, CS52, CS-562, CS-512, CS-532, CS-522, CS-451
  • Aqua-Pure: AP3961137, 1257074
  • Bosch: 640565, B20CS5, B20CS8, B20CSC81SNS, B20CS81SNW, B20CS81SNB, B20CS51SNS, B20CS51SNI, B20CS51SNSB

About Omnipure

The Omnipure Filter Company developed the world's first disposable inline water filter in 1969 and their products soon found regular usage as an accessory attached to ice machines, refrigerators, water coolers, coffee machines, and as a component in other filtration systems such as Reverse Osmosis Systems and other multi-level filtration processes. With over 44 years in the water industry, Omnipure has built a reputation for manufacturing the world's best disposable inline water filters.