Eshopps PF 800 overflow box and water level

[Charney]

I have several tanks that utilize the PF 800 overflow boxes. The tanks have two to three of these overflows and it works great. I have the tank turnover right where I want it for all of the tanks but I am not happy with the water level. They are all at about the trim level which I don't like. How do I make it lower? The water level doesn't seem to change regardless of where I set the height of the overflow box portion in the tank

Thank you

 

[duanes]

Very confusing....because In theory, lowering the in tank box, should automatically lower water level.
When using these overflow boxes, I found they could not keep up with pump flow I needed, so I replaced the standard J (U) tubes, with larger 1 1/4 " inner diameter U tubes, and that, solved "my" problem. Whether a larger inner diameter tube (higher flow capacity) would solve yours, I don't know.

https://hosting.photobucket.com/albums/i97/dstuer/overflows/.highres/image001-65.jpg?width=1920&height=1080&fit=bounds

 

[Charney]

so I tried putting in 2 U tubes and did not see a difference. I just got some 1.25 and 1.5 U tubes in the mail yesterday so I am going to give them a try