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Theoretically you could just find one of those air driven filters that fits that output hole and have it pump water back into tank side, then other compartments in sump you can just put some standard block foam and they will get water pulled through them.

But I really don’t see point when you can get a small submerged pump for <$9 and a block of foam

https://www.amazon.com/dp/B06XKW2K8Z/ref=cm_sw_r_cp_awdb_t1_PGRMDbMK8DTVF
 
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