[John Jamieson]

"High Efficiency Particulate Air (HEPA) Filter A throwaway, extended-media, dry type filter with a rigid casing enclosing the full depth of the pleats. The filter shall exhibit a minimum efficiency of 99.97% when tested at an aerosol of 0.3 micrometers diameter. The maximum airflow resistance shall be as specified in Section 5.2, Table 1 of this standard."

It looks like standard HEPA filters can catch the spores, but I'm not sure what kills them. Titanium dioxide sounds like the stuff you put on your nose to prevent sunburn.

[~Vor~]

"Titanium dioxide sounds like the stuff you put on your nose to prevent sunburn."

I think that's zinc oxide...:)

[Donald Stone]

I think that is zinc oxide.

[Fredgoblu]

Titanium dioxide sounds like the stuff you put on your nose to prevent sunburn

TiO2 is the white hiding pigment of choice in the paint industry. From what I understand, it's also used to color any of a number of consumer products, ranging from paper to food. Any time you see white, guess TiO2, and you're probably right.