The porous stone filter element is cleaned by directing a blast of high-pressure air through it from the inside, blowing the debris the filter catches to the outside. A little fresh gasoline or lacquer thinner and a narrow paintbrush will help to brush away the displaced dirt. Don't try the same procedure with a paper filter- - - -the air will blow holes through the filter media big enough to throw a medium-sized cat through it!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!