CDC explains that reverse osmosis uses a semi-permeable membrane with extremely small pores (around 0.0001 micron) to remove a wide range of contaminants. RO systems can reduce parasites, bacteria, and viruses, as well as many chemicals like lead, copper, chromium, chloride, and sodium, and may also reduce arsenic, fluoride, nitrate, and other dissolved inorganics, depending on system design. The specific substances your system reduces are defined by its NSF/ANSI 58 certification and listed reduction claims, so it’s important to choose equipment that’s been independently tested for the contaminants you care about. When we install an RO system in your Brevard County home, we’ll review your water information, discuss your concerns, and recommend NSF/ANSI 58–certified equipment that’s a good match for your goals.