Sleep disturbances 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. Long before there were machines to work out on and competitive sports to remain moving and before wars were being fought, man didn't think about conditioning as a means of keeping healthy. He simply knew if he didn't hunt, he wouldn't eat and when he didn't run, something would hunt him. They were tough times that focused simply on survival.