Sump baffle question

[mmorrison55]

This will be my 1st non glass sump.

In that sump, it has the typical glass panel baffles that are glided at different heights that require the water to flow over or under. In the new sump I had built, the chamber adjacent to the return pumps has two upper and two lower baffles (pic attached).

My question is would I close off the lower or the upper baffles or have one of each like in the photo? Im assuming I would close off the two lower to require the water to rise higher that the return pumps, but im not sure if this is right or just a choice. I’d rather get it right before I fill it with water and have to crawl under the cabinet to change it out.

 

[Asm481]

It looks to me the way it is now the level won't exceed a couple inches, never reaching the higher level weir. Unless you have a ton of flow. Maybe I am not seeing it right. I see 2 returns, are they separate spaces or one area.

 

[mmorrison55]

It’s one long return chamber. I currently have one baffle high and one low, but thats only because I have not changed them out to be either both high or low.

Im assuming I need to put the solid parts low so the water flows up and over them. My question was more of a why is there an open ion to set the open baffles low? Maybe im not seeing why someone would want to do that.