Nothing wrong with the filtered ones, but not really useful unless you're dealing with amps and are clumsy with snapping off the top.
Make sure you're pushing in the amount of air equivalent to the amount you're removing. Filtered will draw slower.
There are 3 loves in my life: my wife, my English mastiffs, and my weightlifting....Man, my wife gets really pissed when I get the 3 confused...
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