I have done zero testing. Mine has been full for 10 years now. Bank is all grass. The run off is just my yard and its all grass as well.

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