Biobor Jf Fuel Anti-fungal . Used by commercial airliners to keep fungi from fouling their fuel Biobor JF can be used to kill existing growth in contaminated tanks 1oz. to 40gal. and to prevent growth in clean tanks. Measure-marked easy-squeeze pint container aids addition to fuel without messy spills. Used as a growth preventative one-half ounce treats up to 40 gallons of fuel. 32 Oz