
Cleaning the pre-filter will not extend the life of the other two filters as the manf. shows; In fact, the opposite is true: the dirtier it gets, the more effectively it captures particles (even finer ones), thus reducing the amount that reaches those internal filters. However, you also don't want it to get clogged. We clean ours about once a month by simply vacuuming and brushing. The activated carbon filter is used to adsorb gases and vapours. Unlike absorption, adsorption creates a strong chemical bond between the vapor/gas and charcoal, which is why it is used in military gas masks and chemical suits. For most contaminants, this bond can only be broken by a high-pressure steam treatment process. Even washing in hot water or even using a pressure washer will not destroy the connections. Flushing only removes external dust/particles that accumulate on it after passing through the pre-filter. It's easier to just remove them with a vacuum brush and clean the pre-filter at the same time. Lasts every 2 minutes. The "HEPA" paper filter is nothing special and cheap to manufacture. We buy them separately from other manufacturers/sellers. We don't buy the Hepa filter/Carbon filter kits you see everywhere because there is very little activated charcoal in these filters, which are colored black to hide this fact. Some manufacturers/vendors sell high density carbon filters either cut to size or ones that can be cut to size. Of course, they absorb gases and vapors much better, last much longer and are cheaper. Also easy to clean with a vacuum cleaner.

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