Green bark mulch
Have to agree with landscape fabric, and with Briggs being junk.
Had one in my sander, blew out the bottom end with less than 700 hours
The one on our debris loader has been re machined twice because of a "defect" and has still gone through more than 26 push rods and the top end (mainly valves) has been gone through 6 times this year alone. Motor has less than 100 hours on it and will be replaced with a Honda next year