How do you guys keep the duck pool clean of poop?

[BantyChooks]

I have 29 ducks and have 4 kiddie pools. I rinse them out and refill once a week. Drinking water trugs are filled every day.
As you can see in these two photos, they can get the water filthy in their pools even while I am filling them.
View attachment 1648275 View attachment 1648276

But, with all the rain we have had the past few weeks the ducks have been enjoying puddles around the barn, in the garden and yard when they've been free ranging.
They love noodling everywhere!

29 ducks! I'd go insane. I love my seven dearly, but boy, do they make a lot of work for me. I would definitely cut back to three if I could find the others a permanent home where I could get updates on them.