Diesel bug treatments cells to rapidly kill diesel bug


Grotamar 82


Marine 16 treatment


Yachticon Diesel Plus


Wasp Biokem


Kathon FP 1.5


Shock dose per litre: 2.5ml Shock dose cost per litre: 8.7p Maintenance dose p/lt: 0.15ml Maintenance cost per litre: 0.5p Bottle size: 1lt Bottle cost: £34.99 n www.echamicrobiology.co.uk CONTAMINATION


pg cATP/ml before: 12.10 pg cATP/ml after 1 day: 3.88 pg cATP/ml after 10 days: 0.95 cATP reduction: -92% FILTRATION RESULTS


Faster than control by: 47%


Grotamar 82 was developed to combat problems from low-sulphur biodiesel blends, and achieves its aim well. The 92% kill rate is good, and the sample proved the swiftest of the biocide- treated fuels through the filter. The product did a good job of dispersing the water into the fuel, although this is not its primary purpose. There were some minor deposits left in the bottom of the flask.


Shock dose per litre: 1ml Shock dose cost per litre: 8.7p Maintenance dose p/lt: 0.05ml Maintenance cost per litre: 0.4p Bottle size: 100ml Bottle cost: £8.71 n www.marine16.co.uk CONTAMINATION


pg cATP/ml before: 42.57 pg cATP/ml after 1 day: 1.33 pg cATP/ml after 10 days: 1.45 cATP reduction: -97% FILTRATION RESULTS


Faster than control by: 36%


Our results suggest that this was the fastest biocide to act, doing all its work in the first 24 hours with no change over the next nine days (within the 5% error of the test). The bottom of the flask showed some gummy deposits and debris, but water was well dispersed. Marine 16 say that further doses will break down the debris. They offer another product for ongoing treatment, Diesel Fuel Complete (see page 100).


Shock dose per litre: 1ml Shock dose cost per litre: 3.4p Maintenance dose per litre: 1ml Maintenance cost per litre: 3.4p Bottle size: 500ml Bottle cost: £16.95 n www.meridianzero.co.uk CONTAMINATION


pg cATP/ml before: 3.71 pg cATP/ml after 1 day: 1.46 pg cATP/ml after 10 days: 1.06 cATP reduction: -71% FILTRATION RESULTS


Faster than control by: 28%


Diesel Plus is claimed to be more than just a biocide, improving fuel efficiency and making your engine run more smoothly. Unfortunately, on our test it yielded below-average performance with gummy deposits and poor water dispersion at a high price. However, the 24-hour


result shows that it did set to work swiftly, suggesting that a higher initial dose may be needed in severe contamination cases.


Shock dose per litre: 0.3ml Shock dose cost per litre: 2.7p Maintenance dose p/lt: 0.1ml Maintenance cost per litre: 0.9p Bottle size: 250ml Bottle cost: £22.60 n www.separ.co.uk CONTAMINATION


pg cATP/ml before: 62.65 pg cATP/ml after 1 day: 18.17 pg cATP/ml after 10 days: 1.45 cATP reduction: -98% FILTRATION RESULTS


Faster than control by: 38%


Wasp recommend three dosage levels, so we chose the 0.2ml/lt rate suggested for a moderate case such as ours. Results were good, with the 98% kill rate among the best on test and an average 38% result on the filtration. The treatment cleaned the fuel effectively and left no sticky deposits, but did not do as well dispersing water, which would need separate attention to ensure its removal.


Shock dose per litre: 0.3ml Shock dose cost per litre: 0.6p Maintenance dose p/lt: 0.3ml Maintenance cost per litre: 0.6p Bottle size: 5kg Bottle cost: £99.50 n www.separ.co.uk CONTAMINATION


pg cATP/ml before: 20.84 pg cATP/ml after 1 day: 10.93 pg cATP/ml after 10 days: 4.35 cATP reduction: -79% FILTRATION RESULTS


Faster than control by: 32%


Our results show Kathon with middle-of-the-road performance on both the kill rate and filter tests, but at just 0.6p per litre you could easily double the dose to increase its effectiveness. If you’re a major fuel user this is worth considering. Of concern however were the sticky deposits left at the bottom of our sample, which would need attention, although it did disperse the water.


Excellent filterability and kill rate, and only minor debris


Good dispersal and speed, but further treatment needed


Practical Boat Owner 534 May 2011 • www.pbo.co.uk


Gummy deposits suggest a bigger dose is needed


A good kill rate and no sticky deposits


Cheap, but sticky deposits are of concern


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