Omnipure K5655-JJ 2.5-Inch by 12-Inch Deionizing Mixed Bed Filter with 1/4-Inch QC Straight Media Type: Mixed bed DI (Deionizing) resin, for polishing RO product water Capacity: 270 Grains (1 year maximum) Max Service Life: 1 Year Self-Contained Inline filter design requires no filter housing Filter Size: 2.5" Diameter x 12" Length 1/4" Quick Connect (Straight)