Culligan CW-F Level 3 Advanced Filtration Sediment Replacement Cartridge, 2pk: * Fast, simple in-home test * Helps determine the contaminants in your household water supply * Checks for hardness, wide range pH, nitrites and nitrates, chlorine, chloramine and low range iron * Mail-in testing is available for lead, nitrate/TDS and sodium/iron * Kit includes test strips, test bottle and analysis information * Product life: 1 time use * Model# TK-2