Welcome to Helotes. Surrounded by the beauty of the Texas Hill County, the City of Helotes is a vibrant community boasting a flourishing economy and a high quality of life. Located just northwest of San Antonio, Helotes was incorporated in 1981 as a Type A General Law City.
The passive diffusion samplers act as a filter, so field filtering is not necessary. In fact, passive diffusion bags (PDBs) will block potassium permanganate from samples for sites using it in their remediation processes. PDB Samplers. Samples volatile organics. Available in both pre-filled and unfilled versions.
Thus, it can be used to insulate something that is cold against air that is much hotter than the item and it can also be used to insulate something that is hot against ambient air that is much colder than the item. You can go from one to the other frequently and it will not harm your cooler bag.