Where can I find Filter Sock?

No they will not. I've never seen anything that fine anywhere. Usually Filter socks are 100 or 200 micron. I use 53 micron sieves for copepod eggs. 4, 5 or 10 will filter out everything and have very very very low flow.
 
Josh, I understand 4 to 10 Micron will filter out everything and slow. I need those for binding phosphate...I hope I can find in local, otherwise will order online.
 
I've never seen a sock with that fine of rating. I've only seen sieves and paper elements that fine and those were in labs. Good luck.
 
I just made my own and got the material from Michaels. At 25cents a piece, im happy with the results. If they are not fine enough, double them up.
 
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