Filter in Power Steering Return?

I use this one in a older truck I just purchased. It is basicly a screen to catch bigger crud but does have a magnet in it also to catch all the fine metal. The steering was fine I just pulled the reservoir out to clean ( a lot of crud and grime at the bottom) and flushed it.
http://m.advanceautoparts.com/mt/sh...593-P?un_jtt_v_cookiecheck=on&un_jtt_redirect