Having never been a huge believer in the tank condensation theories that are bantered around, I wanted to see for myself how much water was actually in the absolute bottom of my tank. The answer was nada, zilch & nothing. Those gray flakes are from the plasma cutter and the fuel looked bad but still no water separated out at all. I found it rather interesting that after 31 years I found absolutely no water in this fuel tank. Perhaps the fuel treatments really do work for something..? The previous owner never even topped it off in the winter, and I drain it, but still the original pick up tube was 1.4" off the dead bottom of the tank so you never get it all. I will continue to change the deck fill o-rings, multiple times per year, as it does seem to work well..