The RO water filtration system RO100 is a multi-layered filter system that provides optimal protection against over 1, 000 contaminants, including lead (removes up to 98% of lead), chlorine, fluoride, arsenic, asbestos, calcium, sodium, and more. The Reverse Osmosis system consists of 5 different stages, each one designed to progressively remove contaminants and improve water quality, all the filter and RO membrane are made in the U. S. A.