The RO5 5-Stage Reverse Osmosis System removes the total dissolved solids (TDS), chlorine, chloramines, and other chemicals that are present in tap water, leaving you with water the way it was meant to be. Because reverse osmosis is so effective, it removes between 90 - 99% of contaminants found in the water, even the aerospace industry recycles the water on the spacecrafts using reverse osmosis.