Those filters are chinese and probably crap? All I know about metal gauze filters is that they were popular in cars in the sixties like early minis, washable in petrol and reusable, but they didn't work too well only filtering particles to 50 microns at best and were quickly changed over to paper. They have been known to fall apart too, certainly the modern the CRT brand ones do anyway! Modern metal gauzes will perhaps do 30 microns, but that'll still mean a lot of sh1t will be getting through. A decent paper filter, such as a K&N or Hi-Flo will do down to 10 microns or and some down to 7.

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