All good answers. Thank You your quick responses. The chemical means I have recorded so far are bleach, iodine 10%, iodine 2%, polar-pur, cloro-floc, potable aqua, and potassium permaganate. Though I only carry a pur hiker filter, potable aqua, and the means to boil in my larger kits I would still like to know any other means out there just in case I come along such chemicals or materials in a survival situation.