The HW800 ALKAPRO Tankless Reverse Osmosis Water Filtration System consists of a spiral flow RO Filter, a 3-in-1 PAC Composite Filter and a Post Carbon Filter; It boasts a superior filtration performance of removing heavy metals (e.g. lead), harmful substances, dissolved solids, chlorine and other common contaminants from tap water, at a filtering precision of 0.0001μm (micron); The Coconut Carbon Block in the Post Carbon Filter is sourced from coconut shells, providing a natural way to filter your water and improve the taste.