What pore size of filter mesh will hold blackworms?

[Jennewt]

I built a custom blackworm storage/rinsing device. I used a nylon mesh (maybe 100 micron size, but I'm not sure) to drain the worms. It worked great at first, but the filter has quickly gotten clogged. It's glued in place, so I can't routinely change it.

I tried buying an 800-micron mesh filter bag, but that's too large - the worms wiggle through.

Does anyone know what is the largest pore size that will prevent blackworms from getting through?

 

[Jennewt]

Aha, I found an answer to my own question. And - bonus - it's an interesting article about a setup for keeping blackworms at room temp. They used 450-micron mesh.
Blackworms are Easy - Page 11 - The Reef Tank