I took out the anode in 2007, threw it away and replaced it with a brass nipple and ball valve. flush instantly and often. Why change a good heater until it leaks? Side story. A friend almost got talked into a new heater because the plumber I think had no work. " I can install it today" I told him to call the plumber back and he would call when it leaks. That was 12 years ago. The heater is still going strong and my friend has passed. Moral-- don't be rushed into spending money you might not have to.