WaterChef CR70 Countertop Filter Replacement Cartridge (for C7000 Filtration Systems) Powerful Big Block Filtration Technology - Superior Contaminant Reduction & Taste Huge 1,000 GALLON Capacity! - Filter More. Spend Less Tested & Certified by NSF International for Trusted Performance (ANSI/NSF 42 & 53) Easy to Install (includes NEW Battery for C7000's Intelligent Monitor) Manufactured in the USA