Need overflow plumbing advice

[nereefpat]

Yep. Check valves are unnecessary if the system is set up correctly. I agree they are prone to failure too.

The return lines into the display should be close enough to the surface that they will air lock if the return pump quits.

 

[saltwater newby]

Makes sense

Yep. Check valves are unnecessary if the system is set up correctly. I agree they are prone to failure too.

The return lines into the display should be close enough to the surface that they will air lock if the return pump quits.