I was looking at sierra charts for how they display the volume that is filtered and in the forum they say that its not possible to reliably detect large orders I wanted to see how the people that claim to have a volume filter actually get this info. FYI they also say even the CME matching engine isnt 100% since they will only display orders filled at the same price. Now im confused i originally thought that any order showed in T&S was really just a resting order that was filled on the other side. Ex) 10 contracts sold really means that (1) order on the bid for 10 contracts was filled but this could have been actually 1, 2 or more different order sell orders