Material Safety This filter is made with food-grade and lead-free materials. No harmful substances are contained in this product. Use it with confidence for your family. This kind of filter is recommended for tap water filtration. If your water source is well water, this filter may not achieve the filtering effect you expect, because well water contains large particles such as mud and sand which may clog the filter in a shorter time. If you need to treat well water, please search and purchase our other products: B074FT4TZS.