refugium questions

[it-cost-what]

i am starting to build a refugium and need a little help wanted to know whether i should put protien skimmer before the refugium or after the refugium in the filtration line. and do i need to have the drain line go through a filter sock or filter material before entering the sump? thanks for the help

[KarlBob]

Note: This is the third copy of this post. The question has been answered on both of the other copies.