NO. All of the materials used to produce WaterChef shower filters have been carefully selected by our engineering team during the design phase. As a further precaution, WaterChef shower filters have been independently certified for complying with the material extraction requirements under NSF/ANSI Standard 177. Essentially, this part of the standard looks for any foreign substance that may be inadvertently imparted into the filtered water. If a foreign substance is present above the limit established by the standard, the product will not meet the certification requirements.