I have been using one of these for the last 18 months. I pulled it out for the first time 2 days ago to have a look what it had caught. Nothing whatsoever. No water, no particulate matter, nothing. I have used fuel from most sources over that time and have come to the conclusion the filter, whilst sound in principle, is not needed here in Thailand. Filling up with the filter installed is a real pain as they cause the bowser to cut off due to the restricted flow. Mine won’t be going back in.
I’m sure there are locations on earth where these would be worth their weight in gold....Thailand isn’t one of those!