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Choosing a fuel biocide: How does Bellicide compare to Biobor?

Posted by: Erik Bjornstad

Fuel biocides are an essential and necessary part of the arsenal employed by fuel storage professional to kill microbes in fuel and keep away the problems that they cause. Across the nation, more and more people and companies are checking their tanks and beginning to realize the extent of the problem in their stored fuel – the modern ultra low sulfur diesel fuels don’t resist microbes like it used to, and many of their storage tanks (that they haven’t checked for years) now have big problems with microbes.

So they go looking for something to solve the problem and that brings to this biocide chemical.  But which to choose? Not all biocides are the same and there are major differences in performance that are important to consider.

Biobor – The biggest name on the market

The most well known biocide out there is Biobor JF, manufactured by Hammonds Industries.  It’s been around since the early 1960s and touts numerous engine and equipment manufacturer recommendations.  As such, there is a perception among consumers that Biobor JF is the best because it may be the only one they can recall hearing about. A big reason why it’s well known is that it was the first biocide that was universally approved for use in jet fuel. This is where the ‘JF’ comes from.  Its manufacturers have done an excellent job of leveraging this into additional recommendations.

Market share and effectiveness do not always go hand-in-hand.

In order to make the right choice, it’s essential to know what makes a good biocide.  You should consider these characteristics:

Kills quickly - Once mixed into the fuel or fluid, the most effective biocides will achieve the most complete kill rate in the shortest time.

Maintains a complete kill for the longest period of time - The best biocides will maintain their complete kill rates for the longest time possible. 

Resistance to pH changes - The best biocides will work equally well in both acidic (pH < 7.0) and basic (pH > 7.0) environments.  Maintaining effectiveness in acidic environments is especially important because fuels and liquid with severe microbial contamination will tend to be acidic, due to the acids produced by microbial respiration as they grow and thrive in the liquid.

Effectiveness in both fuel and water phases - This is essential when using a biocide in stored fuel. The presence of a water phase (a layer of water under the fuel) is always associated with microbial growth because microbes need the water phase to grow and thrive.   Some biocides react with water, becoming less effective as their active ingredient is changed into innocuous by-products.  

Bellicide vs. Biobor JF

Let’s compare  Biobor JF to Bellicide (the biocide from Bell Performance) with respect to performance in these critical areas.

Bellicide v Biobor_infographic_DOCUSE_0515_nopricing

Sensitivity to pH – Bellicide and Biobor JF are two of the better biocide chemistries in the marketplace that are least sensitive to pH levels of fuel or liquid. 

Effectiveness in water phase – This is a big difference. Biobor JF, in stark contrast, loses effectiveness in the presence of water.  In fact, it is well known within the industry that Biobor JF undergoes a chemical reaction when it comes into contact with water (as in what would happen in a storage tank).  This reaction changes the active ingredient into non-biocidal by-products, reducing its effectiveness once the biocide treatment moves into the water phase of a tank.

How effective is Biobor at killing microbes?

Because the purpose of a biocide is to kill microbes, it’s important to look at how effective they are at killing microbes and maintaining a microbe-free environment for as long as possible. We can see some interesting things if we look at some comparative kill studies using different treat rates and different strains of microbes.



This seems to be a lot of data to cull through, so here’s the summary.  Bellicide (the blue) killed everything, even at the lowest treat rate, all the way through the full 4 week period. Biobor (the red) stopped being effective before 4 weeks at any of the treat rates and was not even fully effective after 1 week in some of the samples

These results should be eye-opening, given that maintaining a full kill rate for as long as possible is an essential trait for any good biocide.

What should we conclude about Biobor and Bellicide?

  • Bellicide kills faster and at a higher initial rate than Biobor JF.
  • Bellicide maintains a complete kill rate significantly longer than Biobor JF.
  • Bellicide does not lose effectiveness in the presence of water.

So what it comes down to is this: Biobor is the most well known, but in our opinion, Bellicide is the better biocide choice.

You may be interested in these other posts on Fuel Storage:

Download Bellicide vs. the Marketplace

This post was published on July 14, 2015 and was updated on October 9, 2019.

Topics: Fuel Storage