Go to home depot and tell someone in the plumbing dept that you want to put a drain in your baby pool for your ducks. We put a piece of pvc pipe into a hole drilled in the bottom edge of our pool and put a plug in it. We sealed everything with some kind of putty stuff (can you tell my dh did this without me) . Every evening when I go to close up the ducks in their house I pull the plug. I turn the hose on in the morning when I get outside first thing. I rinse it out and pour out any sludge that is leftover and voila, clean pool. A plus with this is that while I'm filling up the baby pool the hose is constantly running allowing me to fill the dog's water bowls, chicken's waterers, quail waterers, rabbit waterer, and finally the duck's bowl. By the time the pool is full I am done with my chores. I feed mine outside in the run only. I have one of those rubber tubs for water, I fill it about 2-3 inches at night and put it in the house with them. Enough for a drink but not a swim, and they get no feed at night. Keeps everything pretty dry so far.