The water can go through your sump without really passing much of the media in it, at all. As I said above, I'd guess about 80-90% of your media is "useless" in your current sump.
You'll see it especially on the first pic. The water can really easily go above all the media and thats where 90% of the water will pass, because as I said, water always tries to go the way with the least resistance.

You'll see it especially on the first pic. The water can really easily go above all the media and thats where 90% of the water will pass, because as I said, water always tries to go the way with the least resistance.

