powerhead inside overflow box?
 

when using a durso standpipe.... does anyone put a powehead inside the overflow box to keep the debris suspended so it gets a chance to get sucked in instead of settling at the bottom of the overflow

never thought of that but i gotta admit if your running matalla in the sump i don't see why that wouldn't work

Even after nearly 5 years with dursos never really had buildup in my chambers, if was a concern could always just siphon out during water changes.

That's what I do. Every once in a while, I'll siphon out the overflow. I have live rock in my overflow, so it's a little worse than most, and it's still not an issue.