Hexagon Alkaline Water Filtration System 2 Cartridge 1,2 & 3 (Full Set of 3) Cartridge 1: It removes chlorine, Micro-particulate Contaminants, Sludge& Rust. Cartridge 2: A specially blended mineral block that produces; Bio-available ionized minerals. Cartridge 3: It absorbs organic and inorganic cheminals. With KDF to help meutralize the heavy metals in the water. Cartridge 1 & 3: Good for up to 6,000 liters or 1 year; Cartridge 2: Good for up to 3,000 litres or 6 months (whichever hapens sooner). You will get set of 2 Hexagon Alkaline Water Filtration System 2 Cartridge 1 (NOT including cylinder case and lid), 2 & 3.