The video, posted by MParr, is not very helpful.
Pleated filter media can do a good job , however it is hard to judge the degree of material caught/blockage and there is the ever present risk of the media breaking down and entering the carburettor. Use a gauze filter medium.
Opaque filter casing do not allow inspection at all. Need to be replaced at regular intervals ($) as the operator has no idea when they may be about to block. Use a clear/transparent filter.
The in- tank "filter" is known as a "Finger Strainer" - its main job is to catch large contaminates, before they enter the supply system. More appropriate filtration can/usually takes place down stream before the carburettor.
