Hi Warren,
Congrats on surviving that disaster. Guess it isn't over yet. What type of filter? I'm making educated comments as I have no specific knowledge. If it's sand there should be no problem. My guess is that the soot is not oily so anything that gets trapped in the filter should wash out on backwash. I'm also assuming you don't want to vacuum to waste as that wastes a lot of water. The soot particles may be too fine to be trapped in the sand so you may try the DE trick of adding a little DE powder to improve the trapping of smaller particles. Again, depends on the type of filter. Maybe someone else has some ideas.
Al
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