Yup. the little Edge pre filters can clog seriously, and just the little rinse out in old bucket water wont work.
My 12G Edge tank was at trickle, so I rinsed and it seemed fine, then I gave it a solid squeeze and it was brownish and it continued for minutes of rinsing in the tub faucet, I couldn't believe how much crap came out and kept coming out.
Every 2 weeks I rinse it, but never blast it with water straight out of the tap, but wow did it ever need a big cleaning. Water was blasting out of there after it was put back on!!!
Today I bought a few new prefilter sponges on clearance at Petco. And the weird chimney brush looking thing as well for the tubes.