It has become apparent that hydrogen sulfide (H2S). hydropersulfides (RSSH) and other polysulfide species are all intimately linked biochemically. Indeed. at least some of the biological activity attributed to hydrogen sulfide (H2S) may actually be due to its conversion to RSSH and derived polysulfur species (and vice-versa). https://www.bekindtopets.com/save-now-Aqua-Pure-3MFF101-Full-Flow-Drinking-Water-System-Replacement-Cartridge-flash-choice/