I use an inline filter like this:
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That particular picture is from a US company called "Bouncer" I think it is, if you want to search for videos and stuff. However, I bought mine from China in a job lot and have some spares if anyone is interested.
I've found this type of filter is more useful than the bazooka style that came with my Klarstein:
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This screws into the outlet at the bottom of the mashtun. The problem is, once it's full and blocked, there's no way to really unblock it or clean it, because it's at the bottom of the wort.
The "Bouncer" style can be put inline somewhere. I place it just after the tap but before the re-circulating pump. When it's full and blocked, turn off the pump, disconnect the filter, clean it, re-attach and re-start pump. It can be a little messy when disconnecting, with wort retained in the hoses (just disconnect over a bucket), but certainly easier than trying to clear something under 25L of wort.
The in-line style can also be used at bottling/kegging time to keep trub out of the beer.