Yes, filter media (coal or ...

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Yes, filter media (coal or sand) will definitely block cartridge filters.

Did this facility re-fill any media filters recently? if new media is installed and fines are not washed out correctly during installation, it is possible that a load of fines clogged the cartridge filters when the filters came online for first time.

The high SDIs and the particles probably are one and the same problem (SDI is just a measurement of how quickly a 0.45micron filter clogs).

If the coal particles are big, they are most probably filter media espaping from a filter unit if the integrity of the filter floor has been compromised.