We recommend storing Dr. Willard's Water products in plastic containers, not glass containers. One of the properties of Dr. Willard's Water will penetrate any contamination on a solid material, breaking the bonds that hold the impurity to the material. In the case of glass, in time, fine particles of the glass surface settle to the bottom of Dr. Willard's Water causing a layer of sediment on the bottom of the glass container. There is no problem with using glass containers when drinking the water, time is the problem.