TEH BEST WAY I FOUND WAS TO SPEND 2-3 DAYS PULLING OR DIGGING THEM OUT BY THE ROOTS. AFTER THAT ITS JUST A MATTER OF PULLING OUT A FEW AT TIME THOUGH OUT THE YEAR. MINE ACTUALLY CAME OUT PRETTY EASILY. PULLING OUT THE FIRST FEW HUNDRED IS THE HARD PART. OF COURSE MY POND HAS A SAND BOTTOM WHICH MAY MAKE IT EASIER TO PULL THEM OUT.