Replacement Filter Kit for Watts ZRO-4 RO System - Includes Carbon Block Filter, PP Sediment Filter & Inline Filter Cartridge - Denali Pure Brand Replacement Watts ZRO-4 Water Filter Cartridge Kit. Quantity: 1 Activated Carbon Block Filter, 1 Polypropylene Sediment Filter, 1 Inline Filter Cartridge Denali Pure Universal 10 inch filter for WATTS PREMIER 500029 ZEROWASTE REVERSE OSMOSIS SYSTEM Universal 10-inch Activated Carbon Block Filter, Polypropylene Sediment Filter, Inline Filter Cartridge. Improves taste and clarity while retaining beneficial nutrients by reducing chlorine, fine sediment, odor, silt, rust. Removes undesirable and possibly harmful waterborne contaminants, particles, chemicals and microorganism. High efficiency and high dirt holding capacity for longer filtration and fewer replacements. Reduce water bottle waste and save money while also helping the environment by using water filters. For the highest quality water and best contaminant reduction replace the filter every 6 months. On Sale for a Limited Time!