Aries FilterWorks (AF-20-4010-BB) 20" x 4.5" Big Blue Mixed Bed Deionization (DI) Water Filter Cartridge - High-Purity Resin for TDS & Ionic Contaminant Removal - Semiconductor Grade, Made in USA 500 GPD 4 "X 40" Fast-response sensor and large LCD

Fast-response sensor and large LCD deliver clear readings in seconds without waiting for stabilization

Media is recyclable and creates no harmful byproducts during filtration

Low-Flow Precision

Fits existing Q-Series filter heads with quick-connect or NPT fittings

Aries FilterWorks (AF-20-4010-BB) 20" x 4.5" Big Blue Mixed Bed Deionization (DI) Water Filter Cartridge - High-Purity Resin for TDS & Ionic Contaminant Removal - Semiconductor Grade, Made in USA 500 GPD 4 "X 40" Fast-response sensor and large LCDAries FilterWorks AF 20 4010 BB 20" x 4. 5" Big Blue Mixed Bed DI Cartridge Semiconductor grade deionization resin for ultra pure water in whole house, industrial, and laboratory filtration systems Mixed Bed Ion Exchange Made in USA ResinTech Resins 14 18 Mcm The AF 20 4010 BB combines cation and anion exchange resins in a 20" x 4. 5" double open end cartridge to remove total dissolved solids, minerals, salts, and ionic contaminants from water.