I'm really not sure but just guessing 10,000 square feet would be a pretty close guess. A rake made for it is so helpful for sure. Glad it's working out 4ya. Good luck and stay with it and you will win the battle.

The people who say I can't do it can just sit the @^#% down and watch me. Friends call me Rusto I also subscribe to pond boss mag. http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=504716#Post504716