Filter Sock, What is this for?

[SteveMM62Reef]

What is this plastic web for

 

[badluckman]

I guess to be able to easily lift them out. That's at least what I use it for.

 

[jnvd3b]

Some people use it to ziptie or string the sock over the pipe rather than having a filter sock holder

 

[Arabyps]

It's to facilitate removing the sock from the holder when changing socks.