Cladiosporium Resinae issue
For Info Only as I have some interest on this matter.
Cladiosporium Resinae thrives between Jet A1 and Water, water can be held in suspension and distributed throughout Fuel Tank during refuelling or pool and drain towards Weather head after a lenght of time. CR can be found to thrive at any point where moisture can be trapped inside a fuel tank.
Maintenance Manual Procedures state Weather Head draining to be carried out prior to refuelling first flight of the day ( drain the water which has pooled once released from suspension) regular draining post refuelling throughout the day is a token procedure and will collect some water.
The Weather Head is a component and its fastener prevents it from being totally flush from the tank lowest surface so some pooled water always exists.
Regular operations and biobor treatment minimisers CR growth. Dead CR is toxic to aluminium and its protective finish ( fibreglass gell coats as well, then osmosis does the rest of structural damage).
Routine maintenance inspection will purge and evacuate A/C fuel tanks and dead and live CR should be found and removed with any discrepancies.
A/C left idle and exercise low operating hours will have an increase activity and more costly repairs.
So I guess there could be a market for sponge that will purge and evacuate lipids from bacteria killing them with out absorbing fuel. There is one close, for now we are stuck with routine maintenace.
Note: This fuel contamination has increased since Singapore took over Austalia's refining tasks, obviously the product is within limits or is that just a coincidence.