... 3).High quality,quick lead-time ZF ZF HEPA Air Purifier FilterProduction description:Hepa filters made by filter cartridges, ... to purify and absorb the stink substances in the air such as ammonia, fluorine, formaldehyde, methanthiol, hydrogen sulfide ... non-toxic, harmless, no sensitive reaction. Application:1). Water purification, air HFPA purifier, air filter bags etc.2). Medical nano silver masks, ...