Thank you!
I have Hobby and JBL. As I wrote, they have 0,3mm, 0,18 mm and 0,15mm.
0,3mm is too big, and 0,18 mm too small to let
Naupliae through, except a few very small naupliae,
these really without eggs .
Now I can get a 0,2 mm, I’ll order this for my next try.
