Your Braun iron should be used with tap water. In the case of high calcium content water we suggest using demineralised water diluted with 50% with tap water.Never use demineralised/ distilledwateronitsown.Do notusechemicalsubstances ordetergents(e.g. scentedwater, essences, decalcifying solutions, etc.).For further details please consult the product user manual.