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Finally, you can choose how long it is until the background image changes, from mere seconds to minutes, from a couple of hours to just once a day. Click "Save changes" to commit these edits and go back to your desktop to await the next change in its visual finery. Diesel particulate filter, filters the particulate matter by forcing the exhaust gases to pass through a ceramic wall flow filter. The ceramic wall flow filter features a porous wall and is single ended. When the spent gases are forcibly passed through the porous wall, the particulate matter is filtered along with the gas is discrete thereby lowering the particulate emission inside atmosphere.