Omnipure K5686-JJ Inline Carbon Filter with Scale Inhibitor and 1/4-Inch QC Straight Media Type: Polyphosphate for scale control, plus granular activated carbon (GAC) to remove chlorine, taste & odor Service life: 2,000 Gallons (6 months maximum) 1/4" Quick Connect (Straight) Filter Size: 2.5" Diameter x 12" Length