You can see just how much dirt and filth the filter picks up in a year's time. Remember that the top filter is a lot like a lint trap, so the dirty filter on the left is the bottom layer of two filters. This means that the air coming out of the SaniDry is as close to purified air as you are ever going to get in a crawlspace. It is free of mold spores, allergens, and other tiny problems.
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