Can Someone Help Me Figure Out How To Flush?

[PocketGrower]

hey guys. Growing in fox farm cocoloco, on week 6 day 4 and beginning my flush tonight... any tips on stuff I should be flushing with and also how to go about (how long I flush for) it??

Setup is a 8k hps room
All fox farm cocoloco
3gal, 5gal and 10 gal pots .
I use sensi AN products ,
Big bud
Voodoo
B52
Cal mag. Etc

 

[MW7945]

As in your pre-harvest flush?