I have put similar structures in my own ponds. In my experience you will grow filamentous algae on and around the structure, but they will be slow to clog. You may even want them to clog a little bit. The algae will grow microscopic zooplankton for little fish to feed on. You'll have to warn future anglers about the structures, because the best way to damage them is to have someone using superline and hooking, then tearing the cribs.
