Algae won’t grow in diesel fuel if it is kept dehydrated; it is easily demonstrated using a water glass, a small amount of DF2 and a small amount of water.
When the water is added to the fuel, it simply sinks to the bottom raising the fuel as it floats on the water.
You can easily see the line where they meet and it is at this interface that the algae is allowed to grow.
Once the fuel is being pumped, trace amounts of contamined water and algae are pumped into the filters where they are trapped until they eventually overwhelm the filter and the engine being fed dies of starvation.
Eliminate the water, prevent its entry or dry the fuel with solvents and the problem can be managed.
Didn’t know that, thanks for the tip!
And/Or add biocide that kills the algae.