Once you realize that you have water in your tank, you will need to weigh your options for how to best handle the situation.
Luckily there are a number of different solutions available to treat potentially corrosive environments.
Single Point In Time Solutions
First, you could use biocides to slow the microbial growth. This treatment kills off most, but not all, bacteria that are causing the biofilm. While this does act to slow corrosion in the short term, it does not rid the tank of water, so the environment is still ripe for residual bacteria to thrive and presents an opportunity for the return of microbial growth in the future that will have to be dealt with. The tank will require consistent treatments with this approach, which increases the chances that the biocides could negatively impact employees that come into contact with them.
Another option is to do an emergency tank cleaning and fuel polishing. This will rid the tank of any water and clean out the microorganisms, but this is also a single point in time treatment, so there is no assurance how long the cleaning will last before you would need to do it again.
Both biocides and a tank cleaning with fuel polishing are one-time events, so they do slow corrosion in the short term but are going to be temporary solutions. These methods alone are not a good long-term solution because the tank environment can revert to being conducive for corrosion as soon as water is introduced again.
Continuously Removing Water
Fuel conditioning systems like HydrX™ are a great option for treating corrosive environments. This system continuously filters out water, rust, sand, and microbial particulate from the fuel. It then returns the cleaned fuel back to the tank, acting as a fuel polisher. The benefit here is that it is removing the water and bacteria on an ongoing basis, which is the best way to mitigate corrosion caused by microorganisms.
Unlike other fuel conditioners, the HydrX Fuel Conditioning System includes a Water Intake Device that reaches the lowest point of the tank bottom to ensure that all stagnant water is removed. Entrained water in the fuel is then removed by the integrated filtration element, maximizing water removal and providing optimal fuel quality.