A genuine, OE part from the manufacturer, the RFFE20-BB Pentek water filter cartridge is designed to reduce up to 3 ppm of dissolved iron from your home's water. By reducing iron content, your water will be less likely to cause damage to your appliances or leave rust-colored stains in your ceramic plumbing fixtures. Most importantly, your water will also be free of that coppery, metallic flavor that you will commonly taste in the back of your throat when drinking water with higher iron levels. Built to fit into 20 inch Big Blue water filtration systems. Order the RFFE20-BB Pentek iron-reducing, water filter cartridge today!