what I found in my tank when I cleaned it out was a very fine powdery sediment. I also found this in the bowls. the screen in the tank was obviously not able to protect from that fine of a material. While I don't know the filter level of the in-line I installed, I can only say it's worth a shot (to me) to try to avoid further problem.I wonder if the powdery sediment is from ethanol evaporating. When I stopped adding TCW3 oil in with my gas it was not long after that I had to remove the carbs and send them to be cleaned/jets unclogged. The carbs were coated with this yellowish powdery substance. I removed and cleaned the tank and due to being scolded about not adding TCW3 I never forgot to do it again.
I wonder if the powdery sediment is from ethanol evaporating. ...
Disolved "feric/iron" salts, picked up and carried on the fuel/water, from tank to float bowls... Invisible as a solid during the formation, but once allowed to "sit" in the aluminum floatbowl, electrons bonding occurs, and they re-form into "larger" crystals, which you see after storage.. filtration is ineffective for removing the dissolved microscopic structure.. it's basically like dissolved into the solution.. and only 're-forms" when it sets in the bowls.. in the presence of oxygen., then sticks to the surfaces of the bowl, as fuel evaps.
Having had "cheapo" clear plastic filters, on various bikes, and never "seeing" any contaminants, but having the filter body break, and an inopportune time, dumping fuel, and requiring an "emergency splice on the road".. I choos not to ever have that happen again, and the metal "can" NAPA filters, just don't cut it for me, as I can't see the fuel in them either...
Just my personal observations, and if the bike is run regularly, and during storage, tank topped up, and stabilizer used, and no "half tank air with moisture" sitting.. it's about as good as you can do. No filter, that will flow fuel well, will prevent that "micro migration", as the iron is dissolved, in the liquids.