pack of 2 cartridges for #9500

A special design allows this HEPA (High Efficiency Particulate Air Filter) cartridge to be a lightweight and compact unit, while having a minimum efficiency of 99.97% in removing small particles measuring 0.3 microns (i.e. - only 3 particles out of 10,000 penetrate filter). High efficiency (P100) chlorine/hydrogen chloride, (muriatic acid) cartridge/filter. Helps protect against particles, fumes, mists, acid gases and organic vapors. Ideal for many projects: painting, mold abatement, lead and asbestos, cleaning. Ideal for cleaning swimming pools. Read all instructions and warnings before using .