Normally we will put the sample into 100 ml cylinder first and leave it sedimentation.
Then you will get two layer ..top layer less suspended solid we will pour this slowly..first and wait for a while (fast drain)..
Then the rest is more suspended solid (bottom layer) will be poured later after 1st-pouring (less suspended solid) almost dry on paper.
This is method we do always.
Otherwise if drain immediately whole surface of filter paper will be blocked...that why drain slowly...take long long time.