Looks like the BioD is cleaning out some crud in your tank. It's amazing how much junk is in #2. Hopefully, you won't have as much as I did. Recently, I had to have the screen in the tank cleaned and the tank drained and cleaned.
From the looks of that filter, it was pretty clogged.
How long has that filter been on? I've run a similar looking filter without any problems but it did get changed probably every 5000 miles.

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100