I find sedimenters are very important in Biodeisel systems and veg oil systems!
Even with one, it ( Glycerine as I believe it to be ) still falls out of suspension after 6 months of settling and can still bypass the primary sedimenter and accumulate in my filter!
I also understand that professionals are loath to store Biodeisel long term ( over a year ) due to possible problems.... can't recall what but assumed it was degradation of fuel....
My solution is to regularly drain both my inline sedimenter and recommend (but don't do it myself, ones fuel filter between services and to use almost a full tank to almost empty before I refuel regularity. I also flush a tank of diesel through every 6 months as a precautionary measure!
5 years on last vehicle, two tank system bio diesel and wvo ( filtered) and steel tanks sparkling clean!