I couldn't find those specs on the manufacturer's website.

They do say the filter requirements are a minimum of 150 mesh.

I have had good luck with these inexpensive filter screens at 155 mesh. They are easy to disassemble and flush, and then clean the filter if needed.

Dig Filter Screens

I also use the DIG brand flag drippers. They can be twisted apart to be cleaned. I also like running two per tree. If one plugs, it is easy to catch during a visual inspection when the other one is merrily dripping away. (Plus the tree still gets a drink from one dripper when I don't walk my lines often enough.)