The P1 spun polypropylene standard duty filtration cartridge works in HF-150A, HF-160, HF-360A, and HF-365 whole house filtration systems Perfect for residential homes, helps protect appliances and pluming from sediment and scale Features a flow rate of 4 GPM and filter life of 2 months/8,000 gallons (depending on usage and water conditions) Reduces: sediment, rust, scale, dirt, coarse sand, sand, fine sand, extra fine sand and silt The HF-150A is tested and certified by WQA against NSF/ANSI Standard 42 for materials safety and structural integrity only Designed to allow water to taste as pure as possible Resistant to chemical and bacterial attacks The Culligan Level 4 P1-D is certified to remove the following contaminants: Sediment, Rust, Scale, Dirt Sand, and Silt