Once my ducks dirty the pool they don't go back to it. We only dump it and fill once a day, usually when it is the hottest because they enjoy the fun of cooling off with that cold well water. They do have a few drinking containers set around for dipping their faces into but for a swim, they have to wait for me to dump and fill. If the economy ever gets better we will get our small pond and filtration system put in but right now we can't justify the cost when we may need that money. I love to set up the sprinkler but we do that only when it is unbearably hot because they can do so much damage to the ground. It isn't going to take long for them to dig up the farm. I used to move it around so they got a new area but then realized I might as well let them destroy just one patch of ground constantly.