pond is 1/2 to 5/8 of an acre and has never completely filled. So other then the one time I started up the siphon to drain the pond to do repairs it has never been used. So that could be one reason I don't see any issues. Realize that it was real close in June 11 to kicking in (it may have and I did't notice)and then the drought of '11 and '12 kicked in. We have had good rain this year but the pond is still 3' low. Was higher a month ago but the rain faucet has turned off again and the level is dripping again.