Whirlpool Large Capacity 10" x 4.5" Whole House Water Filter System WHKF-DWHBB, 1" Port, NSF Certified Reduces Sediment, Sand, Soil, Silt, Rust, Includes Installation Kit & Timer, Filter Not Included: Amazon.com: Tools
Whirlpool WHEERF 2-Pack Carbon Block Under Sink Replacement Filter in the Replacement Water Filters & Cartridges department at Lowes.com