10 " Dual Big Blue Water Filter System |Includes:KDF55/GAC/SEDIMENT FILTERS Whole House Water System |Compact design | Easy filter Change | Assembly Required. Unique, wide cartridges are capable of filtering enough water for a house, apartment or office. 1st Stage-Sediment Filter : Removes dust, particles, and rust. Protects & extends life of system 2nd Stage: Multi Staged Filter for maximum purity- GAC & 2 pounds of KDF 55.