6-Pack Replacement Pentek RO-2550 Activated Carbon Block Filter - Universal 10 inch Filter for Pentek RO-2550 RO 50 GPD wReverse Osmosis System - Denali Pure Brand Replacement Pentek RO-2550 Activated Carbon Block Filter, Quantity: 6 Replacement Pentek RO-2550 Activated Carbon Block Filter Coconut shell carbon, universal 10 inch activated carbon block filter. 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. 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!