bio material is designed to not clog.
Not sure how you could design media to not clog.
You provide surface area that is available to free flowing bacteria, but detritus flows free also.
Even a system using 20/30 micron filtering will allow the bio media to clog.
It just takes allot longer.
Some of that stuff will always attach to your media, smothering the bacteria or displacing it.
Example,
You set up a system, start a fishless cycle.
With no waste to deal with you end up with a healthy bacterial colony in your bio media.
Cycle completes and you add your fish.
Waste begins to circulate.
You notice no changes to your water parameters as your bio media begins to "gunk up". The in tank bacteria has grown in proportion to any smothering in your bio media.
All seems well.
You do some vigorous tank maintenance or redecorating and end up with a cloudy water situation.
Happens all the time.
I really don`t think the average guy can come up with a way to keep the media completely gunk free.
Nor do I think you need to do that.
Just being aware of whats` going on and an occasional media cleaning is all that is needed
$0.02
Not sure how you could design media to not clog.
You provide surface area that is available to free flowing bacteria, but detritus flows free also.
Even a system using 20/30 micron filtering will allow the bio media to clog.
It just takes allot longer.
Some of that stuff will always attach to your media, smothering the bacteria or displacing it.
Example,
You set up a system, start a fishless cycle.
With no waste to deal with you end up with a healthy bacterial colony in your bio media.
Cycle completes and you add your fish.
Waste begins to circulate.
You notice no changes to your water parameters as your bio media begins to "gunk up". The in tank bacteria has grown in proportion to any smothering in your bio media.
All seems well.
You do some vigorous tank maintenance or redecorating and end up with a cloudy water situation.
Happens all the time.
I really don`t think the average guy can come up with a way to keep the media completely gunk free.
Nor do I think you need to do that.
Just being aware of whats` going on and an occasional media cleaning is all that is needed
$0.02

, you know i dont fully subscribe to this theory. Bacteria are govern by surface tension of all masses surrounding them to aid in transportation regardless. Piece of crud lodges, its engulfed based on growth potentials. Youve got to bring it into perspective - bacteria are $%^ing tiny and in quantified numbering. 

