Showerhead trickle filter.
I haven't done this myself, but I heard it from a friend. He has for his filtration setup an overflow connected to a 3/4" tube, that is connected to a showerhead in a vice (it is a little noisey). The showerhead sprays onto air conditioner filter (you know that blue stuff) which is half submerged in water. The entire setup goes into a sump.
Failing to prepare is preparing to fail.