The Pentek DBC-10EX2 is a KDFGAC combo water filter with 2 lbs. of KDF55. It is designed to reduce chlorine taste and odor, water-soluble heavy metals, and control scale, bacteria, and algae in your water. KDF is a patented media that consists of high purity copper-zinc granules that use redox (exchange of electrons) to effectively reduce chlorine and heavy metals as well as controlling microorganisms in potable water.