Flocculant Question

You can try to soak the filter first on a solution of trisodium phosphate (TSP can be found in hardware stores in the paint section just make sure it’s REAL TSP and not some “eco-friendly” knock off). After soaking the carts for a few hours you can then rinse them and give it a try.

There’s a good chance your cartridges are hosed so I’d set your expectations low and be prepared to buy new ones.
 
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