Pentek - PCF1-20MB - 20" x 2.5" Mixed Bed Deionization FilterPentek Professional Grade Deionization PCF1 20MB 20" x 2. 5" Mixed Bed DI Filter Cartridge FDA compliant mixed bed resin for pharmaceutical, laboratory, and precision manufacturing applications requiring ultra pure, demineralized water 600 Grain Capacity Mixed Bed Cation Anion Resin FDA Grade Media Polypropylene Pre Post Filtration The Pentek PCF1 20MB delivers full demineralization for critical low flow applications where near zero TDS is required.