PI®PRIME K8 Filter Cartridge – Maximum Water Quality for Medium to High Water HardnessThe PI®PRIME K8 filter cartridge is the ideal solution for households with medium-hard to very hard tap water (8 °dH and above).It combines state-of-the-art filter technology with natural mineralization and ensures clean, great-tasting, and energized water—without any chemical additives.Important note: This ca...