[sumtechguy]

It is not much of a 'trap' it is basically a plastic filter just before the drain out. Think it mostly is to keep big stuff out of the sump. But bits of cloth and hair can get stuck on it. You also probably do not want to totally drain it all the time. The sump as someone else pointed out needs to stay wet.

On mine it is a circular item that you can twist out. If I do it before draining water comes dumping out of that. So I drain then clean that thing. Bit of hot water and a bit of scrubbing.