2 pump sump, return chamber sizing

[Trever]

1. Assume one sump, one DT, and more than one return pump. Can the sump have more than one return chamber?

2. i think a sump can be one big tank, no chambers, but chambers are the norm if for no other reason than usually there is at least a return chamber, to help protect the pump from debris.

I'm confused about how big a return chamber needs to be though. It needs to fit the pump(s). But backflow when the pump is off can leak upstream into the rest of the sump, as I understand it, and commonly does, so the return chamber doesn't need to hold the backflow- correct?

Can one make the return chamber as small as possible since it doesn't do anything other than protect the pump?

Should we not make a small return chamber because it's where evaporation brings down the water level and that won't happen upstream?

Despite a lot of reading and hours in front of Youtube, sumps still boggle me a bit.

Thanks in advance

 

[Badilac]

Just get a custom sump from LifeReef with the retrun chamber in the middle. Something like below. He will build you anything you want.