Arsenic is used in hardening of copper and lead alloys, paint pigment applications, textile and different industriela application. Arsenic has been taken to the material group that makes cancer by US Environmental Protection Agency. Minimum limit mus be lower than 5 ppm. When zeolit contacted with the water which has arsenic ions, zeolit holds arsenic ions. Arsenic is not washed by water so it is turned to solid waste and sent away from system.