Shurhold, the brush people, make a type of filter funnel called Mr. Funnel.
Up until recently they didn't have one with enough capacity to be used for fueling large boats.
They now make one that will pass 12 gpm. I've used the smaller ones off and on for about thirty years and they really do work.
You can fill them with water and nothing comes through.
Pour in some contaminated gasoline or diesel and out it comes leaving the water and dirt in the funnel.
Large Fuel Filter Funnel - Fuel Filter Funnels | Shurhold
I've never used a Baja Filter so I can't say which is better.