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Don't laugh, but I fit a stocking over my snorkel. Yes a ladies' leg stocking (black of course). Obviously doesn't filter dust but keeps all objects larger than say a millimetre out of the air box. Been using them for years after being surprised how many bugs and bits of stick were getting through. It's a great improvement. As far as real filtering, I just stick with paper filters and change them out as needed. They're a consumable like oil filters so I dont sweat it.