I use a small pond liner that we sunk in the ground in the duck run. We put a drain in it and the water runs into a small ditch we dug. We found this used and it didn't cost much. It doesn't fit all my ducks (I have 5) but they don't all love it, so for the first year I also kept a blue kiddie pool on my patio that they all swam in everyday. We put a ramp up to it and cinder block inside so they could easily get in and out. Kale did a good job covering the troubles with the wading pools. I used a bucket to pull water out of it before dumping it, but it's still a lot of work to do this and keep the pool clean. This summer we bought a bigger pond liner and sunk it into the ground in our yard. Ducks love this and have plenty of space. I don't know if it's just my pekins, but they really like to stand on something in the water while they do their bathing, and this liner has a ledge all the way around it that they love standing on. My little welshies could care less about that. We put a drain in it and dug a ditch so the water empties on the other side of the yard. In the summer I needed to change this maybe every 4 days, and I used a scrub brush to scrub the walls so had to get down into it. Now we're having cooler wet weather and I can easily let it go a week and maybe more before changing the water and giving it a scrub. It's still work, but easier than the daily kiddie pool changes, and prettier, and worth it to see how much they enjoy it.
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