I had custom stainless steel lint traps built to my own specs.
they have 2" sumps built in by simply welding the exit pipe 2" higher in the box.
The intake section is separated from the output section by a stainless steel vertical screen that is basically just a plate with holes in it. It's much like a washer or dryer basket surface. It slides in and out of the box, held in two vertical SS channels. This is very easy to clean with a scraper about once every 2 weeks.
You can get them in different sizes and thicknesses:
http://www.amazon.com/Stainless-Perf.../dp/B000H9RUU2
The screens and sump are very effective in keeping out things like bra wires from working their way into the main line.
I also use a fireplace ash shovel to take out any sediment or COINS & JEWELRY from the 2" sump:
http://www.amazon.com/s/ref=nb_sb_no...shovel&x=0&y=0