I have no experience using these types of things. It will just take the right person to read this thread to be able to answer you correctly. Have you tired some of the online pond stores? They should be able to help you with your task.

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