I think your assumption that GTC is the most likely place to cause problems is skewed. Why do you believe that? They go through a lot of fuel and GTC fuel is safer than Guana and probably Spanish and most certainly Grand.. You can pick up water or junk in fuel any place, even here in the states. If you are sucking from the bottom of the tank or if for some reason water is allowed to enter the bulk tank you may get growth. Little unfair to blame GTC for a problem 3 months down the road. Hell you could have even had the problem at WE if they sucked from the bottom of the tank or forgot to put the lid on the tank one night. But, I think what Tom is trying to convey is bring filters, primaries, secondaries, fuel treatment etc. Because you never know what you are going to get. The way we do it is time it with the fuel delivery barge when in the bahamas. Wait 2-3 days after their scheduled delivery and wait for the tanks to settle, then fill up. Best chance to avoid the bottom and getting junk from the tank. We try to only get fuel from those that are filled from a delivery truck, might be sitting on a barge but another good way to avoid problems.