The Blitz filter has a synthetic filter medium and a titanium dioxide (TiO2) coating.
When the Ti02 coating is put out in the Sun for a few hours, it "reacts with natural sunlight and a powerful anti-bacterial & deodorant reaction takes place" and is then ready to be put back into your car.
(from the website)
The regenerative procedure:
Hybrid A/C Filter is blue in color when new.
As it absorbs airborne pollutants, its color turns to brown. So check once every 6 months or every 2 oil change intervals.
Vacuum the filter gently (optional but recommended) & wash it under faucet to dislodge as much dirt as possible.
Let it sunbathe in direct daylight for 6~12 hours so that Photocatalysis can take place to oxidize vital pathogens (i.e. disinfection) & to deodorize a vast spectrum of odors.
Now, your dried filter is ready to be used again.
NOTE: When you notice that the filter has stubborn stain/dirt adhered to it even after repeat washes, it's an indication that the filter may have reached the end of its lifespan because no photocatalysis can take place if the TiO2 coating is blocked.
Please note that a catalyst is neither consumed nor altered in the reaction so theoretically speaking, this TiO2 coating does not diminish. However, it doesn't mean that these filters can be washed & reused infinitely because as particles get trapped by this filter, some portion of the coating is permanently blocked. And as you vacuum & wash these filters, some coating may be scraped off over time. Nevertheless, this is still the world's most environmental cabin air filter.
Ryco, Repco and other generic filters? Pfffft.