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Hopefully it will at least make it better. Let us know how it works out. You might also post the same question in the Ducks Forum for the experienced duck keepers thoughts. They might even have a better idea.

So your max flow is 5200 L/h and you have an upper pond and a lower pond with a waterfall so you have some level of head which reduces your pumps put. Every 10' of pipe from the pump to the outlet is equal to 1' of head. Add this number to the distance from the surface of the lower pond to the...

I'm really sorry but I still don't think it's going to work without the bottom drain. But again, hook it up and give it a go. Are you using an external pump or a submersible and what are the specs on the pump?

I'm not trying to bring you down or anything but that filter is designed for a fish pond. Fish do not produce nearly the amount of waste that ducks will. It is not going to handle the load but you can give and try and see what happens. The filter will likely clog up very quickly. Additionally...

Unless you have a sizable amount of mechanical filtration in front of that it's not going to work!

Hello and welcome to BYC! :frow Glad you joined. I don't believe there is a biofilter that exists that can keep up with what the ducks will deposit into the pond. Not even a mechanical filter followed by a biological filter.