So I might get away with 3 filter cleans if I'm only using 2kg of grain? Whatever makes my process that little bit easier is good
I guess the amount of hot and cold break is somewhat dependent on the amount of grain used, but the trub that you'll be filtering is also contains hops (if you don't use a hop sock). So yes, you might have slightly less trub in your kettle.
I can't remember where I've posted this, but somewhere I mention (and I've seen PP's post) that this method is a giant pain in the ass. The reason I tried this in the first place was to eliminate the whirlpool rest and siphoning step in an effort to save time(i.e. make the brew day shorter and easier). I easily spent just as much time using this "filtering" method. Trust me, once you get just a little bit of trub in your filter, the flow of wort through it REALLY slows down, and gets to the point where it doesn't flow at all. At that point you have to clean it out, I also made sure it was thoroughly sanitized, and start the process over, and repeat 4 times. I'm not saying not to try it, I'm saying that if you're looking to make your brew day easier, this may not be the way to go. But give it a shot once, I did, and figure out for yourself if you like it.